Refraction through a Prism

Author:Kumar Mittal
12th ICSE
IMPORTANT

Important Questions on Refraction through a Prism

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IMPORTANT

For an isosceles prism of angle A and refractive index n, it is found that the angle of minimum deviation δm=A. Which of the following options is/are correct?

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A ray OP of monochromatic light is incident on the face AB of prism ABCD near vertex B at an incident angle of 60° (see figure). If the refractive index of the material of the prism is 3, which of the following is (are) correct?

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A monochromatic light is incident at a certain angle on an equilateral triangular prism and suffers minimum deviation. If the refractive index of the material of the prism is 3, then the angle of incidence is:

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A beam of light consisting of red, green and blue colours is incident on a right-angled prism. The refractive index of the material of the prism for the above red, green and blue wavelengths are 1.39, 1.44 and 1.47, respectively. The prism will:

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HARD
IMPORTANT

Monochromatic light is incident on a glass prism of angle A. If the refractive index of the material of the prism is n, a ray incident at an angle θ, on the face AB would get transmitted through the face AC of the prism provided.

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A parallel beam of light is incident from air at an angle α on the side PQ of a right-angled triangular prism of refractive index n=2. Light undergoes total internal reflection at the prism at the face PR when α has a minimum value of 45°. The angle θ of the prism is:

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MEDIUM
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The angle of incidence for a ray of light at a refracting surface of a prism is 45°. The angle of prism is 60°. If the ray suffers deviation through the prism, the angle of minimum deviation and refractive index of the material of the prism respectively, are:

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The refracting angle of a prism is A and the refractive index of its material is cot A2. The angle of minimum deviation is:

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In an experiment for determination of the refractive index of a glass of a prism by i-δ, plot, it was found that a ray incident at an angle 35°, suffers minimum deviation of 40° and that it emerges at an angle 79°. In that case which of the following is closest to the maximum possible value of the refractive index?

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The refractive index of the material of a prism is 2 and the angle of the prism is 30°. On of the two refracting surfaces of the prism is made a mirror inwards, by silver coating. A beam of monochromatic light entering the prism from the other face will retrace its path (after reflection from the silvered surface) if its angle of incidence on the prism is:

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A thin prism of glass placed in air produces a deviation of 4° in a light ray. If the prism be placed in water, what would be the new deviation? μga=32, μwa=43

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A thin prism of refracting angle 10° produces a deviation of 5° in a ray of light passing through it. Find the refractive index of the prism material and the velocity of light in it.

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The refracting angle of a glass prism of refractive index 1.45 is 60°. At what angle should a light ray be incident at the first face of the prism so that it emerges at the second face just parallel to the face?

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A ray of light incident at 50° on a 60° prism suffers minimum deviation. Find the angle of minimum deviation and the refractive index of the material of the prism.

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A parallel beam of light is incident on a face of a 60° prism. By rotating the prism, the minimum angle of deviation is measured to be 40°. Find the refractive index of the prism material. If the prism is placed in water (refractive index 1.33), then what would be the new minimum angle of deviation?

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A glass prism whose refracting angle is 72° and refractive index 1.66 is kept in a liquid of refractive index 1.33. Calculate the angle of minimum deviation for the parallel beam passing through the prism. (Given : sin 36°= 0.5878, sin 47.2°=0.7336)

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The angle of a glass prism is 59.5°. The angle of minimum deviation is 38.5°. Without using the value of refractive index of the glass, calculate the angle of incidence for a ray of light suffering minimum deviation.

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What should be the refracting angle of a prism of refractive index 1.5, so that a light ray incident on the prism at an angle of 50° suffers minimum deviation?

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A regular 60° glass prism has refractive index 2 for a given wavelength. Calculate the angle of minimum deviation δm. At what angle of incidence should a monochromatic light of this wavelength fall on the face of the prism so as to get a minimum deviation? (use sin 30°=12 and sin 45°=12).

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Calculate the angle of minimum deviation for a glass prism of angle 60°, the refractive index of glass being 1.658. What is the corresponding angle of incidence? Given: sin 56°=0.829.