# Ray Optics-Lens Maker's Formula and Lens Formula (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 1 - 7 of 19

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## Passage Finding a Water in Given Figure. In figure a cylindrical tube filled with water is closed at its both ends by two silvered Plano convex lenses. A point object is placed at a point O on the axis of cylindrical tube.

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: 1 (1 of 3 Based on Passage) Show Passage

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MCQ▾

### Question

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

### Choices

Choice (4) Response

a.

10 cm

b.

14 cm

c.

8 cm

d.

12 cm

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

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MCQ▾

### Question

The length of the cylindrical tube is

### Choices

Choice (4) Response

a.

18 cm

b.

16 cm

c.

20 cm

d.

22 cm

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

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MCQ▾

### Question

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

### Choices

Choice (4) Response

a.

12 cm

b.

8 cm

c.

10 cm

d.

14 cm

## Question number: 4

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MCQ▾

### Question

The focal length of the lens of the human eye is maximum when it is looking at an object at,

### Choices

Choice (4) Response

a.

Infinity

b.

25 cm from the eye

c.

Very near the eye.

d.

100 cm from the eye

## Question number: 5

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MCQ▾

### Question

A 35 mm film is to be projected on a 20 m wide screen situated at a distance of 40 m from the film-projector. Calculate the focal length of projection lens.

### Choices

Choice (4) Response

a.

70 mm

b.

20 mm

c.

40 mm

d.

35 mm

## Question number: 6

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MCQ▾

### Question

What is the refractive index of material of a Plano-convex lens, if the radius of curvature of the convex surface is 10 cm and focal length of the lens is 30 cm?

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 7

» Ray Optics » Lens Maker's Formula and Lens Formula

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Assertion-Reason▾

### Assertion (Ꭺ)

The sun looks bigger at sunrise and sunset than at noon

### Reason (Ꭱ)

The atmosphere of the earth, due to its density gradient, acts as a lens.

### Choices

Choice (4) Response

a.

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

b.

Ꭺ is true but Ꭱ is false

c.

Ꭺ is false but Ꭱ is true

d.

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

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