Refraction Through a Prism

IMPORTANT

Refraction Through a Prism: Overview

This topic covers concepts, such as Prism, Deviation by Prism, Deviation versus Incident Angle Graph in Prism, Condition for Minimum Deviation in Prism, Refractive Index Formula for Prism, etc.

Important Questions on Refraction Through a Prism

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A prism has a refractive index 3 2 and refracting angle 90°. Find the minimum deviation produced by prism

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A ray incident at angle 53o on a prism emerges at an angle at 37o as shown. If the angle of incidence is made 50o, which of the following is a possible value of the angle of emergence.

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MEDIUM
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A parallel beam of light falls normaly on the first face of a prism of small angle. At the second face it is partly transmitted and partly reflected, the reflected beam striking at the first face again, and emerging from it in a direction making an angle 6o 30' with the reversed direction of the incident beam. The refracted beam is found to have undergone a deviation of 1o 15' from the original direction. Find the refractive index of the glass and the angle of the prism.

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The refractive indices of the crown glass for violet and red lights are 1.51 and 1.49 respectively and those of the flint glass are 1.77 and 1.73 respectively. A prism of angle 6° is made of crown glass. A beam of white light is incident at a small angle on this prism. The other thin flint glass prism is combined with the crown glass prism such that net mean deviation is 1.5° anticlockwise.
A screen is placed normal to the emerging beam at a distance of 2 m from the prism combination. Find the distance between red and violet spot on the screen. Which is the topmost colour on screen.

MEDIUM
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A ray of light undergoes deviation of   30°  when incident on an equilateral prism of refractive index   2 . What is the angle subtended  by the ray inside the prism with the base of the prism is ?

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A given ray of light suffers minimum deviation in an equilateral prism P. Additional prism Q and R of identical shape and of the same material as P are now added as shown in the figure. The ray will now suffer

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EASY
IMPORTANT

A given ray of light suffers minimum deviation in an equilateral prism P. Additional prism Q and R of identical shape and of the same material as P are now added as shown in the figure. The ray will now suffer

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HARD
IMPORTANT

A ray of light is incident on a prism as shown in the figure. The total deviation suffered by the ray is x°2. Then find x. (BAC=1° and CAD=2°, refractive indices are shown in figure.)

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MEDIUM
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Calculate refractive index of a equilateral glass prism for a light of red colour. Angle of minimum deviation for red colour is 30°.

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A ray of light incident at an angle of 48° on a prism of refracting angle 60° suffers minimum deviation. Determine the angle of minimum deviation in degrees.

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The angle of _____ increases with the increase in the angle of prism.

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The angle of deviation depends on the refractive index of the glass.

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When a beam of white light passes through a prism it gets

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For a given prism, the _____ light deviates most and the red light deviates least.

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A ray of light makes normal incidence on the diagonal face of a right angled prism as shown in figure . If θ=37°, then the angle of deviation is sin37°=35

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EASY
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A ray of light passes through an equilateral glass prism in such a manner that the angle of incidence is equal to the angle of emergence and each of these angles is equal to 34th of the angle of the prism. The angle of deviation is 

HARD
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Maximum deviation occurs in a homogeneous prism of refracting angle A1 and having critical angle of its material as A2, when the  angle of incidence is -

HARD
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A light ray incidents normally on one surface of an equilateral prism. The angle of deviation of the light ray is (Refractive index of the material of the prism =2 )

MEDIUM
IMPORTANT

A ray of light is incident on a prism as shown in the figure. The total deviation suffered by the ray is x°2. Then find x.

(BAC=1° and CAD=2°, refractive indices are shown in figure)

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MEDIUM
IMPORTANT

A ray of light passes through an equilateral prism such that angle of incidence is equal to angle of emergence and the latter is equal to 34th of the angle of prism. The angle of deviation is (in