# Ray Optics (NEET Physics): Questions 59 - 63 of 105

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## Question number: 59

» Ray Optics » Snell's Law

MCQ▾

### Question

A ball is dropped from a height of 20 m above the surface of water in a lake. The refractive index of water is . A fish inside the lake, in the line of fall of the ball, is looking at the ball. At an instant, when the ball is 12.8 m above the water surface, the fish sees the speed of ball is,

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 60

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

Assertion-Reason▾

### Assertion (Ꭺ)

A rainbow cannot be seen at noon, when the sun is high in the sky.

### Reason (Ꭱ)

A rainbow is formed by dispersion of light.

### Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

Ꭺ is false but Ꭱ is true

c.

Ꭺ is true but Ꭱ is false

d.

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

## Question number: 61

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

MCQ▾

### Question

Calculate the dispersive power for crown glass from the (given data: )

### Choices

Choice (4) Response

a.

0.0163

b.

0.0183

c.

0.0112

d.

0.0142

## Question number: 62

» Ray Optics » Total Internal Reflection

MCQ▾

### Question

Mirages are observed in deserts due to,

### Choices

Choice (4) Response

a.

Total internal reflection of light

b.

Interference of light

c.

Dispersion of light

d.

Double refraction of light

## Question number: 63

» Ray Optics » Magnification

MCQ▾

### Question

A lens is placed between a source of light and a wall. It forms images of area A 1 and A 2 on the wall for its two different positions. The area of the source of light is,

### Choices

Choice (4) Response

a.

b.

c.

d.

f Page