Ray Optics (NEET Physics): Questions 54 - 58 of 102

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Question number: 54

» Ray Optics » Magnification

MCQ▾

Question

A concave minor of focal length f 0 (in magnitude) produces a reals image n time the size of the object. What is the distance of the object from the mirror?

Choices

Choice (4) Response

a.

(n2+1)nf0

b.

(n+1)nf0

c.

(n+1)nf0

d.

(n1)nf0

Question number: 55

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

MCQ▾

Question

A girl stands at a distance 30 cm from the mirror. She is able to see her erect image but of 1/5 height of actual height. The mirror will be:

Choices

Choice (4) Response

a.

Concave mirror

b.

Convex mirror

c.

Plane convex mirror

d.

Plane mirror

Question number: 56

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

Assertion-Reason▾

Assertion (Ꭺ)

When an object is placed between two plane parallel mirrors. Then all the images found are of different intensity.

Reason (Ꭱ)

In case of plane parallel mirrors, only two images are possible.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

Ꭺ is true but Ꭱ is false

c.

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

d.

Ꭺ is false but Ꭱ is true

Question number: 57

» Ray Optics » Power of a Lens

MCQ▾

Question

An equiconvex lens has a power of 5 diopter. If it is made of glass of refractive index 1.5 then the radius of the curvature of each surface will be

Choices

Choice (4) Response

a.

zero

b.

10 cm

c.

20 cm

d.

5 cm

Question number: 58

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

MCQ▾

Question

In case of thin lens of focal length f an object is placed at a distance x1 from first focus and its image is formed at a distance x2 from the second focus, find x1x2

Choices

Choice (4) Response

a.

f3

b.

f2

c.

1f

d.

f

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