# NEET Physics: Questions 1020 - 1022 of 2142

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## Question number: 1020

MCQ▾

### Question

The focal length of a concave mirror is 30 cm. Find the position of the object in front of the mirror, so that the image is three times the size of the object.

### Choices

Choice (4) Response

a.

20 cm or 40 cm

b.

20 cm (only)

c.

30 cm (only)

d.

40 cm (only)

## Question number: 1021

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

MCQ▾

### Question

A point source of light B is placed at a distance L in front of the center of a mirror of width ‘d’ hung vertically on a wall. A man walks in front of the mirror along a line parallel to the mirror at a distance 2L from it as shown in fig. The greatest distance over which he can see the image of the light source in the mirror is

### Choices

Choice (4) Response

a.

b.

d

c.

2d

d.

3d

## Question number: 1022

Assertion-Reason▾

### Assertion (Ꭺ)

The electromagnetic waves of shorter wavelength can travel longer distances on earth’s surface than those of longer wavelengths.

### Reason (Ꭱ)

Shorter the wavelength, the larger is the velocity of wave propagation.

### Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

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

c.

Both Ꭺ and Ꭱ are false

d.

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

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