# NEET Physics: Questions 967 - 973 of 2142

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## Passage

A cylindrical tube filled with water is closed at its both ends by two silvered Plano convex lenses as shown in the figure. Refractive index of lenses L 1 and L 2 are 2.0 and 1.5 while their radii of curvature are 5 cm and 9 cm respectively. A point object is placed somewhere at a point O on the axis of cylindrical tube. It is found that the object and image coincide each other.

## Question number: 967 (1 of 3 Based on Passage) Show Passage

MCQ▾

### Question

The length of the cylindrical tube is

### Choices

Choice (4) Response

a.

20 cm

b.

18 cm

c.

22 cm

d.

16 cm

## Question number: 968 (2 of 3 Based on Passage) Show Passage

MCQ▾

### Question

The position of object w. r. t lens L 2 is

### Choices

Choice (4) Response

a.

14 cm

b.

10 cm

c.

8 cm

d.

12 cm

## Question number: 969 (3 of 3 Based on Passage) Show Passage

MCQ▾

### Question

The position of object w. r. t lens L 1 is

### Choices

Choice (4) Response

a.

10 cm

b.

12 cm

c.

8 cm

d.

14 cm

## Question number: 970

MCQ▾

### Question

A crown glass prism of angle 5° is to be combined with a flint glass prism in such a way that the mean ray passes undeviated. Find the angle of the flint glass prism needed and the angular dispersion produced by the combination when white light goes through it. Refractive indices for red, yellow and violet light are 1.514, 1.517 and 1.523 respectively for crown glass and 1.613, 1.620 and 1.632 for flint glass.

### Choices

Choice (4) Response

a.

4.2°, 0.0138°

b.

4.4°, 0.0218°

c.

1.2°, 0.0348°

d.

4.2°, 0.0348°

## Passage

A plane mirror (M 1) and a concave mirror (M 2) of focal length 10 cm are arranged as shown in figure. An object is kept at origin. Answer the following questions. (Consider image formed by single reflection in all cases)

## Question number: 971 (1 of 2 Based on Passage) Show Passage

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

MCQ▾

### Question

The co-ordinates of image formed by concave mirror are

### Choices

Choice (4) Response

a.

(10 cm, -40 cm)

b.

(10 cm, - 60 cm)

c.

(10 cm, 8 cm)

d.

All of the above

## Question number: 972 (2 of 2 Based on Passage) Show Passage

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

MCQ▾

### Question

The co-ordinates of image formed by plane mirror are

### Choices

Choice (4) Response

a.

(-20 cm, 0)

b.

(10 cm, -10 cm)

c.

(10 cm, - 60 cm)

d.

(10 cm, 10 cm)

## Question number: 973

» Electromagnetic Waves » Electromagnetic Spectrum » Radio Waves

Assertion-Reason▾

### Reason (Ꭱ)

Sound waves in air are longitudinal in nature.

### Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Ꭺ is false but Ꭱ is true

c.

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

d.

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

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