Prism, Dispersion & Scattering — NEET Physics practice

Question 1

For a light ray passing through a prism, the deviation δ is 30° both at angle of incidence 15° and at 60°. The angle of the prism is:

Accepted Answer

45°

Answer

60°

Answer

30°

Answer

75°

Question 2

In the δ–i graph of a prism, the minimum deviation is 60°, occurring at an angle of incidence of 60°. The refractive index of the prism is:

Accepted Answer

√3

Answer

√3/√2

Answer

2/√3

Answer

√2

Question 3

A 60° prism has refractive index √2. At what angle of incidence does minimum deviation occur?

Accepted Answer

45°

Answer

60°

Answer

30°

Answer

75°

Question 4

The refractive index of a prism is cot(A/2), where A is its refracting angle. The angle of minimum deviation is:

Accepted Answer

180° − 2A

Answer

180° − 3A

Answer

180° + 2A

Answer

90° − A

Question 5

Read Statement A and Statement B carefully and choose the correct option. Statement A: When white light passes through a prism, red light bends less than yellow and violet. Statement B: Refractive indices are different for different wavelengths in a dispersive medium.

Accepted Answer

Both Statement A and Statement B are true.

Answer

Statement A is true, but Statement B is false.

Answer

Statement A is false, but Statement B is true.

Answer

Both Statement A and Statement B are false.

Question 6

Read Statement A and Statement B carefully and choose the correct option. Statement A: In a prism, the angle of minimum deviation is always equal to the angle of the prism. Statement B: The angle of minimum deviation depends on the wavelength of light passing through the prism.

Accepted Answer

Statement A is false, but Statement B is true.

Answer

Both Statement A and Statement B are true.

Answer

Statement A is true, but Statement B is false.

Answer

Both Statement A and Statement B are false.

Question 7

Read Statement A and Statement B carefully and choose the correct option. Statement A: Dispersion of white light by a prism occurs because different colours travel at different speeds in the prism material. Statement B: Red light bends the most when passing through a prism because it has the longest wavelength.

Accepted Answer

Statement A is true, but Statement B is false.

Answer

Both Statement A and Statement B are true.

Answer

Statement A is false, but Statement B is true.

Answer

Both Statement A and Statement B are false.

Question 8

Read Statement A and Statement B carefully and choose the correct option. Statement A: A beam of white light is split into its constituent colours on passing through a prism. Statement B: The refractive index of a prism for red light is greater than that for blue light.

Accepted Answer

Statement A is true, but Statement B is false.

Answer

Both Statement A and Statement B are true.

Answer

Statement A is false, but Statement B is true.

Answer

Both Statement A and Statement B are false.

Question 9

Match the terms related to refraction through a prism (Column I) with their descriptions (Column II). Column I: Angle of deviation (δ); Angle of refraction at the first face (r₁); Minimum deviation (δₘ); Refractive index of the prism (n₂₁) Column II: Determined using the prism angle A and the angle of minimum deviation; The refracted ray inside the prism becomes parallel to its base; Depends on the angle of incidence; i + e − A

Accepted Answer

A→S, B→R, C→Q, D→P

Answer

A→S, B→P, C→R, D→Q

Answer

A→Q, B→S, C→P, D→R

Answer

A→R, B→S, C→Q, D→P

Question 10

In Rayleigh scattering of light, the amount of scattering is inversely proportional to which power of the wavelength?

Accepted Answer

Fourth power

Answer

Square

Answer

Half

Answer

Cube

Prism, Dispersion & Scattering: NEET practice questions

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