# Ray Optics-Deviation and Dispersion of Light by a Prism (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 5 - 9 of 17

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## Question number: 5

» Ray Optics » Deviation and Dispersion of Light by a Prism

Assertion-Reason▾

### Assertion (Ꭺ)

Dispersion of light occurs because velocity of light in a material depends upon its color.

### Reason (Ꭱ)

The dispersive power depends only upon the material of the prism, not upon the refracting angle of the prism.

### Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

b.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

c.

Ꭺ is false but Ꭱ is true

d.

Both Ꭺ and Ꭱ are false

## Question number: 6

» Ray Optics » Deviation and Dispersion of Light by a Prism

MCQ▾

### Question

A thin prism of angle A = 6° produces a deviation δ = 3°. Find the refractive index of the material of prism.

### Choices

Choice (4) Response

a.

0.5

b.

1.0

c.

1.5

d.

2.5

## Question number: 7

» Ray Optics » Deviation and Dispersion of Light by a Prism

MCQ▾

### Question

Dispersive power does not depend upon

(1) The shape of prism

(2) Angle of prism

(3) Height of the prism

(4) Material of prism

Select the correct answers and mark it according to the following codes:

Codes:

### Choices

Choice (4) Response

a.

1 and 2 are correct

b.

1, 2 and 3 are correct

c.

1 and 3 are correct

d.

2 and 4 are correct

## Question number: 8

» Ray Optics » Deviation and Dispersion of Light by a Prism

MCQ▾

### Question

The refractive index of the material of a prism is and its prism angle is 30°. One of its refracting faces is polished. The incident beam of light will return back for the angle of incidence

### Choices

Choice (4) Response

a.

45°

b.

c.

30°

d.

60°

## Question number: 9

» Ray Optics » Deviation and Dispersion of Light by a Prism

MCQ▾

### Question

The wrong statements are

(1) The order of colors in the primary and the secondary rainbows is the same

(2) The intensity of colors in the primary and the secondary rainbows is the same

(3) The intensity of light in the primary rainbow is greater and the order of colors is the same than the secondary

(4) The intensity of light for different colors in primary rainbow is greater and the order of colors is reverse as that in the secondary rainbow

elect the correct answers and mark it according to the following codes:

Codes:

### Choices

Choice (4) Response

a.

1 and 2 are correct

b.

2 and 4 are correct

c.

1 and 3 are correct

d.

1, 2 and 3 are correct

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