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

Read the passage given below and answer the questions that follow:

Finding a water in given figure.

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

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Assertion-Reason▾

Question

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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