Ray Optics (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 31 - 33 of 105

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Question number: 31

» Ray Optics » Resolving Power of Microscopes and Astronomical Telescopes

Assertion-Reason▾

Assertion (Ꭺ)

By increasing the diameter of the objective of telescope, we can increase its range.

Reason (Ꭱ)

The range of a telescope tells us how far away a star of some standard brightness can be spotted by telescope.

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

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

c.

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

d.

Both Ꭺ and Ꭱ are false

Question number: 32

» Ray Optics » Magnification

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: 33

» 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

A point source of light and mirror

A Point Source of Light and Mirror

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.

Choices

Choice (4) Response

a.

Equation

b.

d

c.

2d

d.

3d

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