Ray Optics-Lens Maker's Formula and Lens Formula (NEET Physics): Questions 12 - 17 of 19

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Question number: 12

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

MCQ▾

Question

A convex lens of focal length 20 cm is placed in contact with a diverging lens of unknown focal length. The lens combination acts as a converging lens and has a focal length of 30 cm. What is the focal length of the diverging lens

Choices

Choice (4) Response

a.

- 30 cm

b.

- 60 cm

c.

- 10 cm

d.

- 90 cm

Question number: 13

» 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

Question number: 14

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

MCQ▾

Question

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

Choices

Choice (4) Response

a.

1.5

b.

1.33

c.

1.66

d.

2.0

Question number: 15

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

MCQ▾

Question

Two thin lenses of focal length 60 & -20 cm in contact have a resultant focal length of,

Choices

Choice (4) Response

a.

-15 cm

b.

+30 cm

c.

+15 cm

d.

-30 cm

Question number: 16

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

MCQ▾

Question

An image is formed on the screen by a convex lens. When upper half part of lens is covered with black paper, then:

Choices

Choice (4) Response

a.

Half image is formed

b.

Intensity of image will be enhanced

c.

Full image is formed

d.

None of the above

Question number: 17

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

MCQ▾

Question

A pin is placed 10 cm in front of a convex lens of focal length 20 cm, made of material having refractive index 1.5. The surface of the lens farther away from the pin is silvered and has a radius of curvature 22 cm. determine the position of the final image.

Choices

Choice (4) Response

a.

31 cm in front

b.

11 cm in front

c.

15 cm in front

d.

21 cm in front

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