Refraction by Prism

Practice Questions:

Question 1: difficult

The angle of a prism is ‘A’. One of its refracting surfaces is silvered. Light rays falling at an angle of incidence 2A on the first surface returns back through the same path after suffering reflection at the silvered surface. The refractive index μ, of the prism is :

1. 2 sinA

2. 2 cos A

3. 1/2 cosA

4. tanA

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Question 2: difficult

A beam of light consisting of red, green and blue colours 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 :-

1. separate the red colour part from the green and blue colours

2. separate the blue colour part from the red and green colours

3. separate all the three colours from one another

4. not separate the three colours at all

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Question 3: difficult

A prism (μ = 1.5) has refracting angle of 30°. The deviation of a monochromatic ray incident normally on its one surface will be : –
(sin 48° 36′ = 0.75)

1. 18° 36'

2. 20° 30'

3. 18°

4. 22° 1'

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Question 4: difficult

A ray falls on a prism ABC (AB = BC) and travels as shown in figure. The minimum refractive index of the prism material should be

1. 4/3

2. √2

3. 1.5

4. √3

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Question 5: difficult

For the situations shown in the figure, determine the angle by which the mirror should be rotated, so that the light ray will retrace its path after refraction through the prism and reflection from the mirror ?

1. 1° ACW

2. 1° CW

3. 2° ACW

4. 2° CW

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