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12th West Bengal Board
IMPORTANT
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A convex lens forms a real image of a point object placed on its principal axis. If the upper half of the lens is painted black.

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Important Questions on Refraction at Spherical Surfaces and Spherical Lens

EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 14 - Refraction at Spherical Surfaces and Spherical Lens>EXERCISE 14>Q 8
The distance between an object and a concave lens is m times the focal length of the lens. The linear magnification produced by the lens is
EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 14 - Refraction at Spherical Surfaces and Spherical Lens>EXERCISE 14>Q 9
A thin converging lens of focal length 25 cm forms the image of an object at a distance of 50 cm from the lens. The screen is then drawn closer by a distance of 15 cm. By what distance should the object be shifted so that the image on the screen is sharp again.
EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 14 - Refraction at Spherical Surfaces and Spherical Lens>EXERCISE 14>Q 10
Two lenses of focal lengths f1 and f2 are cemented together and found to possess zero power. Which one of the following is true?
EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 14 - Refraction at Spherical Surfaces and Spherical Lens>EXERCISE 14>Q 11

Two lenses of focal lengths f1 and f2 are cemented together. The equivalent focal length of the combination is

EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 14 - Refraction at Spherical Surfaces and Spherical Lens>EXERCISE 14>Q 12
The distance between the object and a screen is x. If a lens is kept at two positions between them, an image is formed in each case on the screen. The distance between the two positions of the lens is d. The ratio of the sizes of two images is
EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 14 - Refraction at Spherical Surfaces and Spherical Lens>EXERCISE 14>Q 13
A point source of light is placed at a distance 2f from a convex lens of focal length f. The point on the other side of the lens which will have the maximum brightness is situated
EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 14 - Refraction at Spherical Surfaces and Spherical Lens>EXERCISE 14>Q 14
To get a virtual and erect image in all positions of a lens, we require
EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 14 - Refraction at Spherical Surfaces and Spherical Lens>EXERCISE 14>Q 15
The magnifying power of a convex lens is 8.5. The power of the lens is