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To determine the angle of minimum deviation for a given prism using spectrometer

To determine the angle of minimum deviation for a given prism by plotting a graph between angle of incidence and angle of deviation Exp 2. To determine the angle of minimum deviation for a given prism by plotting a graph between angle of incidence and angle of deviation For a given wavelength of light traversing a given prism, there is a characteristic angle of incidence for which the angle of deviation is a minimum. This angle depends only on the index of refraction of the prism and the angle between the two sides of the prism traversed by the light

The refractive index (n) of the material of the prism is given by. where Dm angle of minimum deviation and And A angle of prism. Procedure: 1. Fix a white sheet of paper on a drawing board with the help of cello tape or drawing pins. 2. Draw a straight line XY, using a sharp pencil nearly in the middle and parallel to the length of the paper. 3 To determine angle of minimum deviation for a given prism PRAVESH VASISHTHA. Minimum angle of deviation of Prism Refraction Through Prism & Finding Angle of Deviation Experiment.

Determination of Minimum Deviation For Given Pris

SPECTROMETER - Refractive Index Of Glass prism [46911] AIM: To determine the angle of the given glass prism and the angle of minimum deviation using a spectrometer and hence to determine the refractive index of the material of the glass prism. APPARATUS: Spectrometer, sodium vapour lamp, given glass prism, spirit level and reading lens The Prism Spectrometer (Version 4.0, 1/7/2002) 3 δ Angle of minimum deviation apex angleα min δ > δ Angle of deviation greater than minimum min There exist extensive tables of the line spectra of many elements. In the first part of the experiment, you will be using the known spectrum of mercury to calibrate your prism spectrometer. As a result While making measurements, unclamp and rotate the prism table to check that the prism is oriented for minimum angle of deviation for the red, green, and blue lines. When measuring very closely spaced lines, like the double yellow lines, make the slit very narrow and check the focus. When measuring dim lines, make the slit wider For a given value of n(λ) and A, there is a value of i for which θ is a minimum (see your textbook); this angle is called the minimumdeviationangle D, and is given by n(λ) = sin 1 2 (A +D(λ)) sin 1 2A (5.1) From measurement of D(λ) for a given prism we can therefore determine the dispersion n(λ) of the prism. 5.4 Procedur shown that the ray passes through the prism symmetrically. For a given wavelength of light traversing a given prism, there is a characteristic angle of incidence for which the angle of deviation is a minimum. This angle de-pends only on the index of refraction of the prism and the angle between the two sides of the prism traversed by the light

Exp 2. To determine the angle of minimum deviation for a ..

  1. imum. Under such conditions it can be shown that the ray passes through the prism symmetrically. For a given wavelength of light traversing a given prism, there is a characteristic angle of incidence for which the angle of deviation is 1Physics Laboratory Report-I
  2. imum angle of deviation when angle of emergence becomes equal to angle of incidence. Note: For a given prism, the angle of deviation depends upon the angle of incidence of the light-ray falling on the prism
  3. imum deviation (D) by measuring the difference between emerged ray readings and direct ray.

Under minimum deviation condition in a prism, if a ray is incident at an angle 3 0 0, the angle between the emergent ray and the second refracting surface of the prism is: Medium View solutio Measure the angle of minimum deviation () for the lines (yellow-1, yellow-2, green and blue) of mercury spectrum. Calculate µ for all the lines using the given formula. Now, obtain the spectrum of mercury light and get the yellow-1 line of the spectrum in the minimum deviation position once again and put the point of intersection of. In a prism, the angle of deviation (δ) decreases with increase in the angle of incidence (i) up to a particular angle.This angle of incidence where the angle of deviation in a prism is minimum is called the minimum deviation position of the prism and that very deviation angle is known as the minimum angle of deviation (denoted by δ min, D λ, or D m) Angle of Minimum Deviation through a Prism—C.E. Mungan, Spring 2001 and that the angle of deviation γ is given by there must be two distinct angles of minimum deviation, which is not true. It is also worth remarking on one of the many applications of minimum deviation. Note fro ANGLE OF MINIMUM DEVIATION OF PRISM Objective: Study of the variation of angle of deviation with the angle of incidence by plotting I~ D curve and hence determine the angle of minimum deviation for a given wavelength using a spectrometer. APPARATUS: Spectrometer, Prism, Sodium Lamp and Spirit level

2 hence the angle of the prism 'A' is determined using A = II. To determine the angle of minimum deviation 1. The edge of the prism is placed facing away from the collimator. 2. The refracting image is obtained in the telescope. The prism table is slowly rotated. 3. The image moves, then stops and turns back To determine the minimum angle of deviation for a given prism, we need to plot a graph of the angle of incidence versus the angle of deviation. So, what does the angle of deviation mean? Well! The angle of deviation of a prism is the angle that is obtained by finding the difference between the angle of incidence and the angle of refraction created by the light ray traveling from one medium to. Angle of Minimum Deviation (δ m). We know, when a ray of light passes through a prism deviation takes place due to refraction of light and the angle between the incident and emerging rays represents the angle of deviation. The value of this angle of deviation depends on the angle of incidence In a prism, the angle of deviation (δ) decreases with increase in the angle of incidence (i) up to a particular angle.This angle of incidence where the angle of deviation in a prism is minimum is called the minimum deviation position of the prism and that very deviation angle is known as the minimum angle of deviation (denoted by δ min, D λ, or D m)

Determination of the angle of minimum deviation of a prism and the refractive index of the material of the prism using the spectrometer _____pg 45 1. Location of the images formed by a convex lens by the method of no￾parallax and hence determination of the focal length of the lens________ pg 4 Lecture 27: Discussion on the angle of incidence and corresponding deviation of light through a prism and determination of the angle of minimum deviation for a given prism from the plot of the angle of incidence versus deviation Using either a prism using spectrometer note: for a given prism, mercury,. Greater the angle of minimum deviation and a is the angle it will..! ˂-\B = E =9 { s > E 7 $ ̯ 9F w K ' h ' h x |\ і 7 & h ȚV ] l $ r..

XII PHYSICS PRACTICAL MATERIAL - Padasalai

a) To determine angle of minimum deviation for a given

I attempt to explain the presence of a minimum mathematically instead of experimentally. The light ray travels through air and hits the glass prism, at an angle $\theta_1$ (the angle of incidence) to the normal of the glass boundary.. When the ray is in the glass, the angle of the ray changes to $\theta_2$ (the angle of refraction), to the normal of the glass boundary Section A:- 1. To determine . To determine angle of minimum deviation for a given prism by plotting a graph between angle of incidence and angle of deviation. Subscribe . Class 12th physics experiment (To determine the angle of minimum deviation for a glass prism )part 1. (i) To determine angle of minimum deviation for a given prism by plotting. To determine the angle of a given prism and its angle of minimum deviation and hence calculate its refractive index. APPARATUS: Spectrometer, solid prism, sodium vapour lamp etc. FORMULA : Refractive index of the material of the given prism µ =./0 123 4./0 1 4 (No unit) Where A is the angle of the prism D is the angle of minimum deviation tra. Because of this, slit images formed using a prism are generally brighter than those formed using a grating. Spectral lines that are too dim to be seen with a grating can often be seen using a prism. The Angle of Minimum Deviation The angle of deviation for light traversing a prism is shown. For a given wavelength of light tra- versing Question: Experiment 7: Spectrometer & Prism Objective Determine The Index Of Refraction Of Given Prism Equipment • Spectrometer • Mercury Light Source • High-voltage Power Supply • Prism Procedure To Measure The Angle Of Minimum Deviation, Dm: 1. Align And Focus The Spectrometer As Described Earlier. 2. Use The Two Thumbscrews To Attach The Prism Clamp.

Fig. 1. Refraction through a Prism. Angle of deviation ( δ ):- The passes of light through a triangular prism ABC, The angles of incidence and refraction at the first face AB are i₁ and r₁ while the angle of incidence at the second face AC is r₂ and the angle of refraction or emergence i₂ To determine the dispersive power of a material of prism using Spectrometer APPARATUS Spectrometer, Prism, Mercury Vapor Lamp etc. FORMULA The dispersive power of the prism is given by Where, A = angle of the prism Dg = angle of minimum deviation for green colour Db = angle of minimum deviation for blue colour THEORY A spectrometer is used to. A prism spectrometer can be used to measure the deviation angles. Since the deviation angles also depend upon the index of refraction of the glass from which the prism is made, they can be used to calculate the index of refraction μ at the different wavelengths via: μ=sinA+Dmin2sinA2 (1) where A is the apex angle of the prism and Dmin is the. To determine angle of minimum deviation for a given prism by plotting a graph between angle of incidence and angle of deviation. 5.Carefully remove the prism from the prism table. Sometimes a diffraction grating is used in place of the prism for studying optical spectra. 6.Find the di erence between the direct ray readings and deviated readings

Class 12 Practical 1 - To determine the angle of minimum

Using a spectrometer: Find the refracting angle of a prism by -Angle of reflection of the incident light off the prism's faces -Angle between each prism face lying perpendicular to telescope Find the angle of minimum deviation for the spectral lines from a mercury light source Calculate the index of refraction for each lin Minimum angle of deviation for a prism - definition At the minimum deviation D m , the refracted ray inside the prism becomes parallel to its base. i.e i = e ⇒ r 1 = r 2 = r Then r = 2 A and D m = 2 i − A where i is the angle of incidence, e is the angle of emergence. r 1 , r 2 are the angles of refraction and A is the angle of the prism

Apparatus: Spectrometer, prism, Hg lamp and spirit level Theoretical background When a ray of light is refracted by a prism, the angle between the incident and refracted ray is called the angle of deviation δ. For a given prism angle A and wavelength λ, δ depends on the angles of incidence i and emergence r (See Fig. 1). The angle of. The angle between incident and emergent ray (PQ and RS) for a prism is called as angle of deviation (FigA2). The angle of deviation is called as minimum angle of deviation when angle of emergence becomes equal to angle of incidence. Note: For a given prism, the angle of deviation depends upon the angle of incidence of the light-ray falling on. the angle of the prism = 30 degrees. Explanation: The angle of minimum deviation for a prism = for an equilateral prism, A=60∘. This gives us . taking the Arcsin of both sides we have. Recall that the angle of the prism is equal to the angle of minimum deviation. Hence, the angle of the prism = 30 degree Experiment No.1 Object: To determine the refractive index of a prism by using a spectrometer. Apparatus Required: Spectrometer, prism, mercury vapour lamp, spirit level and reading lens. Formula Used: The refractive index ä of the prism is given by the following formula: ä L sin l # E Ü à 2 p sin @ # 2 A Where A = angle of the prism, δm = angle of minimum deviation There are different methods for obtaining an expression for i min . of which a method is given here. Angle of Prism (degree) Angle of incidence (degree)A graph between i min and n is given in Figure-3, for A=60 0 prism.The graph will help in having apriori knowledge of the minimum angle of incidence

To measure the area of a given window using a sextant and verify the result. 29 10 To determine the height of an inaccessible object. 32 11 To plot graphs (i) between wavelength (λ).) and minimum deviation angle, 1 (ii) Between 1 2 and minimum deviation angle for prism for various lines from the spectrum of mercury discharge source. 35 1 Sometimes a diffraction grating is used in place of the prism for studying optical spectra. Formula Used: The refractive index ä of the prism is given by the following formula: ä L sin l # E Ü à 2 p sin @ # 2 A Where A = angle of the prism, δm = angle of minimum deviation. This angle is called angle of minimum deviation ( m) 1. ANGLE OF MINIMUM DEVIATION OF PRISM Objective: Study of the variation of angle of deviation with the angle of incidence by plotting I~ D curve and hence determine the angle of minimum deviation for a given wavelength using a spectrometer. APPARATUS: Spectrometer, Prism, Sodium Lamp and Spirit level. Overview: A light ray is said to be deviated when there is a change in the path of light ray. prism using spectrometer. Apparatus required: Spectrometer, prism, mercury lamp, spirit level. Formula used: (i) The refractive index of the material of the prism is given by the formula:-µ 2 sin 2 sin A A m Where A= Angle of prism δm=Angle of minimum deviation You can use the minimum deviation formula to calculate refractive index of the material of prism. The relationship between minimum deviation and refractive index is given by μ = sin A + δ m 2 sin A 2 First switch on the source of the spectrometer. Then measure the angle of the rotating table directly keeping eyepiece in front of the collimator

objective for the prism spectrometer. to calculate the angle of minimum deviation and determine the index of refraction of the prism, and to observe continuous line spectra. if the grating has N lines per meter, then the grating spacing is given by: d = 1/N. constructive interference angle of minimum deviation of prism formula. by | Uncategorized. Grafalloy Prolaunch Red 65 Specs, Is Fiji Water Overrated, Alcon Card Balance, Old Airstream Bambi For Sale, Does Bcbs Of Nc Cover Shingles Vaccine, Du Findings Msg Id 3403, Tech Mystery Box, Goldendoodle Adoption Atlanta, Total Drama Fan Art Ships, John Harrison Clock For Sale. Draw a graph with angle of incidence (i) along the X-axis and angle of deviation (d) along the Y - axis. The angle of deviation corresponding to the lowest bend of the curve is the angle of minimum deviation (D). Angle of the prism A is directly measured from the outline of the prism using the protractor What does the angle of minimum deviation of a prism depend upon? To answer such question first look at the formula. In this case look at the formula for the angle of minimum deviation of a prism. What are the variables appearing in the formula? Th..

(b) For your prism the angle of minimum deviation is around 50° so set the telescope at an angle a few degrees greater than this (~55°). (c) Illuminate the slit of the spectrometer with light from a sodium lamp. Rotate the prism table and observe the images of the slit through the telescope as it passes through the minimum deviation position normally it is the angle between a projectile and the horizontal, but can also mean angle of motion and the preferred path refractive index of prism formula derivation Uncategorized / February 25, 2021 / Kark Rashi Punarvasu Nakshatra , 454 Supercharger Kit , Rm Duck Calls For Sale , 96 Fss Commander , Silicon Valley Companies Meaning , Mount Carmel High School Curriculum , Subnautica Reddit Below Zero , Uziza Seed Vs Black Pepper 2. PRISM MINIMUM DEVIATION METHOD Accurate refractive index values at 193-nm and 157-nm for solids have been demonstrated using the minimum deviation method.2,3 The minimum deviation method is commonly used to determine the refractive index of solid materials. A light beam of wavelength O passes through a prism with a known apex angle D

The angle of deviation is a minimum in the symmetric situation when the angles of the incoming and outgoing rays make equal angles with the prism surfa ces. In this symmetric case, the index of. Where A is angle of prism, δm is angle of minimum deviation. Procedure : Following initial adjustment of the spectrometer should made first. • The Spectrometer and the prism-table are arranged in horizontal position by using, leveling screw

To find the focal length of a convex mirror, using a convex lens. OR. To find the focal length of a concave lens, using a convex lens. 3. To determine angle of minimum deviation for a given prism by plotting a graph between angle of incidence and angle of deviation. 4. To determine refractive index of a glass slab using a travelling microscope. 5 Calculate the telescope rotation angle, T, as the difference in both sets of scale readings. Take the average of both values of T to compensate for (possible slight) machining errors in the prism rotation table. Calculate the prism apex angle A using the formula : A = 180° - T (9.3) Step 4—Find the Minimum Angle of Deviation

This means that the angle D has its minimum value D m when the incident ray is directed in such a way that the light passes through the prism symmetricall y with respect to apex A. The angle D m is known as the minimum angle of deviation for the prism at the wavelength λ. It is this particular value of D which we will measure in the laboratory Determine the refractive index of material of a prism for using sodium source by I_D curve method using spect Get the answers you need, now

Refractive Index of Prism Experiment using Spectrometer

  1. What is the prism formula? The formula for the volume of a prism is V=Bh , where B is the base area and h is the height. The base of the prism is a rectangle. The length of the rectangle is 9 cm and the width is 7 cm. What are the types of Prism? Prism Based on Shape of Bases. Triangular prism (has triangular bases) Square prism (has square bases
  2. e the angle of the given liquid prism and angle of
  3. imum angle of deviation of the prism spectrometer many years ago in college. If I remember correctly, it is necessary to use an incident angle ## \alpha ##, and an emerging angle ## \beta ##, and take partial derivatives, and set them equal to zero
  4. imum deviation is 21°.8, and for the 90° ice prism it is 45°.7. Figure I.12
  5. e the angle of the given glass prism and the angle of
  6. imum deviation is measured to be 40°. What is the refractive index of the material of the prism? The refracting angle of the prism is 60°. If the prism is placed in water (refractive index 1.33), predict the new angle of

Physics CBSE Practical file Class 12 (With accurate readings

Home; to find the angle of prism using spectrometer pdf; to find the angle of prism using spectrometer pdf. endstream Y x S *B .C 4T013 30Q 02ҳ T ҏ 44R 4. t. r Ĕ Ĝ L= ͐, t: kW j endobj endstream In this experiment, we will use a prism spectrometer to measure the dispersion angle of various wavelengths To determine angle of minimum deviation for a given prism by plotting a graph between angle of incidence and the angle of deviation. To determine refractive index of a glass slab using a travelling microscope. To draw the I-V characteristic curve of a p-n junction in forward bias and reverse bias As the angle of incidence increases, the angle of deviation decreases to minimum δ m. The angle of minimum deviation is given as. where A is the angle of the prism, μ is the refractive index. For an equilateral prism, A = 60°. Refractive index of the prism (when kept in air) is 1.6. Thus, the angle of minimum duration in air is [using Eq. (1. Measurement of the angle of minimum deviation, δmin for each wavelength. 1. Using the Hg spectral lamp, observe the first order field of view of refracted spectrum. Find the point of minimum deviation for the Hg spectrum. The approximate prism position is as shown in Fig. 5.7 The angle of deviation corresponding to the lowest bend of the curve is the angle of minimum deviation (D). Angle of the prism A is directly measured from the outline of the prism using the protractor. Calculate the refractive index of the material of the prism using the formula, Simulator Procedure (as performed through the Online Labs

Aim : To determine the angle of minimum deviation for a given prism by plotting a graph between angle of incidence and angle of deviation. Apparatus : Drawing board, prism, drawing pins, a white sheet of paper, graph paper and a protractor. 7KHRU\ , I$ L VWKHD QJOHR IWK HSU LVPD QGÅ m is the angle of minimum deviation, the Hello, one of the things I have to do for my lab report for this week is to prove that the angle between the left and right deviations of the telescope is twice the angle of minimum deviation. Its a lab where you have to find the refractive index of substances using a prism and spectrometer cbsencertanswers is a all in one solution fopr cbse students for their ,ncert solutions,extra questions and answers,sample questions ,grammar,notes,on demend assigmnment,online classes on english,mathematics,social science .science,bengali, computer etc spectrometer, liquid contained hollow prism is used to measure the refractive index. Yellow light beam collimated from sodium vapour lamp,monochromatic source was used to determine angle of prism and angle of minimum deviation. The refractive index at different temperature was measured by cooling, the liquid heated up to 70 C and poured it in. The most common method involves measuring the angle of minimum deviation in a prism constructed of the material whose index is to be determined [7, 8]. High accuracy ultraviolet index of refraction measurements using a Fourier transform spectrometer

Angle of the prism using Spectrometer (Procedure) : Optics

To find refractive index of different liquids using hollow prism. Theory Refraction: The refractive index of the liquid is given by the formula: Where: μ = refractive index of the liquid. δ m = the angle of minimum deviation. r = angle of refractio It is clear that an angle of deviation has the minimum value 'δ m ' for only one value of the angle of incidence. The minimum value of the angle of deviation when a ray of light passes through a prism is called the angle of minimum deviation. The figure (3) shows the prism ABC, placed in the minimum deviation position FIG. 2: The prism spectrometer Procedural Steps In order to extract the wavelength dependence of n for your prism, you will need to determine the angles of minimum deviation for the five different light wavelengths that you found in last week's lab. In principle it is necessary to measure the leading-edge angle α The angle dispersion of a prism spectrometer using a fused silica prism with apex angle α = 60° and configured to be in the minimum deviation angle λ = 250 nm. The minimum deviation angle is θ min = 37.83°, and the incident angle is β = 48.91° Glass Prism Experiment. Experiment: To draw a graph between the angle of incidence (i) and angle of deviation (δ) for a glass prism and to determine the refractive index of the glass of the prism using this graph. When light travels from one medium to another in which its speed is different, the direction of travel of the light is changed, when light travels from the medium of lesser speed to.

ANGLE OF MINIMUM DEVIATION FOR PRISM; PRAKASH & MINI - YouTub

and by measuring the angle of incidence ( i1) on to the first surface and the minimum deviation angle for the refraction at the second surface, one can obtain the value of n( ) by simple calculation. The experiment of the minimum deviation angle in prism is one of the topics in the Sophomore laboratory (SUNY-Binghamton) Solution: Given: Angle of prism = 60° Refractive index of prism = 1.41 = √2 To Find: Angle of minimum deviation. Formula: Formula of refractive index of prism in terms of angle of prism and angle of minimum deviation is given b Find Prism Minimum Angle of Deviation Calculator at CalcTown. Use our free online app Prism Minimum Angle of Deviation Calculator to determine all important calculations with parameters and constants Figure 15: Angle of deviation of a prism for α =60 . 2. (a) The angle of deviation for a prism is given in the notes. Plot the angle of deviation (δ) versus incident angle for n=1.5 and apex angle of 60 . (b) The angle of deviation should have a minimum. Derive a general expression for the incidence angle at which the deviation δ is.

SPECTROMETER - Refractive Index Of Glass pris

Correct Option (a) 1.5 . Explanation: If μ is refractive index of material of prism, then from Snell's law. where, A is angle of prism and δ m is minimum deviation through prism.. So, angle of deviation by a glass prism. This angle is greater than the 40 ° deviation angle already given, For greater μ, deviation will be even higher.Hence, μ of the given prism should be lesser than 1.5 in a previous video we saw that when you take a prism and shoot a ray of white the ray of light undergoes a deviation it undergoes a deviation and this deviation has a minimum value and this really we're gonna figure out exactly what that minimum value of this deviation is to figure this out let's name some angles let's call this incident angle as I the ray of light got refracted so let's call. The grating spectrometer permits very precise determination of the angle theta. If the grating spacing d is known, then w can be calculated. Historically, the diffraction grating spectrometer was in use long before the line spectra emitted by atoms were understood

2 Dispersive Power of Prism Experiment No. Object : To determine the dispersive power of the material of a prism by spectrometer. Apparatus : Spectrometer, prism, spirit level, reading lens and mercury lamp. Formula : The dispersive power of the material of a prism is given by R 1) Y v Where V Refractive index of the material of a prism for extreme violet colou A new method of measuring the refractive index of a prism using the critical angle is described. The accuracy of the technique and tolerances on angle measurements are discussed. Two standard prisms were measured using this method and the values agreed with those measured by the minimum deviation method to five units in the fifth decimal place. The prism is now set for the angle of minimum deviation for that particular wavelength. Set the cross-hairs on this red line and read a vernier. The difference between your two measurement is the angle D. Record D for this wavelength, and calculate the corresponding value of the index of refraction of the glass For minimum angular dispersion, the angle is derived from the difference in deviation between red and violet rays of light. Replacing n 2 with n r for red, and n v for violet light in the minimum deviation equation below, we can calculate values of deviation for each colour. Subtracting the angles gives the minimum dispersion angle for white light

Theory of the Prism Spectrometer - Experimen

The angle of deviation D is a minimum if the angle of emergence is equal to the angle of incidence, a condition that can be easily achieved with a prism spectrometer. When the prism spectrometer is set at minimum deviation for a given wavelength, it can be shown that the indices of refraction nl (at that wavelength) are given by Equation 1 Minimum Deviation Angle for a Prism. At a given (fixed) wavelength a prism will refract light through a range of angles depending on the angle of the light incident on the prism. In fact there is an angle of minimum deviation (δ m) as a prism is rotated. Thi A very thin triangular prism has an apex angle of 2. 8 ∘. The refractive index of the prism is 1.4. Find the minimum angle of deviation produced by the prism using the small-angle approximation. Answer to one decimal place 7. To find the focal length of a convex lens by plotting graphs between u and v or between 1/u and 1/v. 8. To find the focal length of a concave lens with the help of a convex lens. 9. To determine the angle of minimum deviation for a given glass prism by plotting a graph between the angle of incidence and the angle of deviation. 10. To draw. Determine the angular deviation δ of the laser beam in the prism at its minimum value using a mirror and the law of reflection as shown in Figs. 7 and 8. Using this minimum angular deviation, δm, of the refracted beam and the known apex angle, H, with the below equation (see page 188 of Hecht)

Spectrometer, Refractive Index of the material of a prism

Prisms. A refracting prism is a convenient geometry to illustrate dispersion and the use of the angle of minimum deviation provides a good way to measure the index of refraction of a material. Reflecting prisms are used for erecting or otherwise changing the orientation of an image and make use of total internal reflection instead of refraction.. White light may be separated into its spectral. A Pellin-Broca prism has the desirable feature that when the deviation is 90° the prism is at minimum deviation for whatever wavelength is being observed. This makes it practical to design a spectroscope in which the telescope makes a fixed angle of 90° with the collimator, and the engraved scale measures rotation of the prism deviation produced in the path of light beam. The angle of deviation δ is minimum when incident and refracted angle of the prism are equal [5]. Therefore, the refractive index, n of the material filled inside the prism or solid prism of apex angle (α) can be calculated using eqn. (1) [7] ) 2 sin() 2 sin(α α+δ n = (1

For a glass prism (mu = √(3)) the angle of minimum

Thus, the angle of deviation has passed through a minimum value, D m. The formula relating the angle of minimum deviation of a particular wavelength to the index of refraction (n) for that wavelength is n = sin[(A+D m)/2] / sin(A/2) where A is the apex angle of the prism. PROCEDURE Calibrating the Spectrometer

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