Ray Optics (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 6 - 11 of 105

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Passage

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

A cylindrical tube filled with water Equation 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: 6 (3 of 3 Based on Passage) Show Passage

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

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

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Question number: 7

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

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°

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Passage

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

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: 8 (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 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)

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Question number: 9 (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 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

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Question number: 10

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

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.

Very near the eye.

c.

25 cm from the eye

d.

100 cm from the eye

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Question number: 11

» Ray Optics » Resolving Power of Microscopes and Astronomical Telescopes

MCQ▾

Question

A Galilean telescope consists of an objective of focal length 12 cm and eye-piece of focal length 4 cm. What should be the separation of the two lenses when the virtual image of a distant object is formed at a distance of 24 cm from the eye-piece?

Choices

Choice (4) Response

a.

8.2 cm.

b.

12.4 cm.

c.

7.2 cm

d.

2.8cm.

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