# Ray Optics (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 12 - 16 of 105

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## Question number: 12

» Ray Optics » Reflection and Refraction of Light » Smooth Surface

Assertion-Reason▾

### Assertion (Ꭺ)

The mirrors used in search lights are parabolic and not concave spherical.

### Reason (Ꭱ)

In a concave spherical mirror the image formed is always virtual.

### Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

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

c.

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

d.

Ꭺ is true but Ꭱ is false

## Question number: 13

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

MCQ▾

### Question

The refractive indices of material of a prism for blue and red colors are 1.532 and 1.514 respectively. Calculate angular dispersion produced by the prism if angle of prism is 8°.

### Choices

Choice (4) Response

a.

0.133°

b.

0.111°

c.

0.122°

d.

0.144°

## Question number: 14

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

MCQ▾

### Question

A ray of light is incident at an angle of 60° on one face of a prism which has an angle of 30°. The ray emerging out of the prism makes an angle of 30° with the incident ray. Calculate the refractive index of the material of the prism,

### Choices

Choice (4) Response

a.

2

b.

1

c.

d.

## Question number: 15

» Ray Optics » Reflection and Refraction of Light » Spherical Surface

MCQ▾

### Question

Two mirrors are inclined at an angle of 50°. Then what is the number of images formed for an object placed in between the mirrors?

### Choices

Choice (4) Response

a.

7

b.

1

c.

3

d.

6

## Question number: 16

» Ray Optics » Snell's Law

MCQ▾

### Question

A light beam is travelling from Region I to Region IV (Refer Figure). The refractive index in Regions I, II, III and IV are respectively. The angle of incidence θ for which the beam just misses entering Region IV is,

### Choices

Choice (4) Response

a.

b.

c.

d.