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12th West Bengal Board
IMPORTANT
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A concave lens of r.i μ1 is immersed in a medium of r.i. μ2. If a parallel beam of light falls on the lens, the emergent beam will be

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Important Questions on Refraction at Spherical Surfaces and Spherical Lens

MEDIUM
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 19
A converging beam of rays tries to converge at a point 20 cm behind a convex lens. But before that the rays are refracted by the lens. If the focal length of the lens is 403 cm, the image will be formed at
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 20
An image is formed on a screen by a convex lens. If the upper portion of the lens is covered by a black opaque paper,
MEDIUM
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 21
A Plano-convex lens of r.i. 1.5 and radius of curvature 30 cm is silvered at the curved surface. It is used to form the image of an object. At what distance from the lens is an object to be placed in order to have a real image of the size of the object?
HARD
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 22
The distance between an object and a divergent 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 23
An object is situated at a distance of 10 cm from a convex lens of focal length 20 cm. The position of the image 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 24
The distance between the object and the screen is D. Real images of an object are formed on the screen for two positions of a lens separated by a distance d. The ratio between the sizes of the images will be
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 25
Inside water, an air bubble behaves
MEDIUM
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 26
An air bubble inside a glass slab (μ=1.5) appears at 6 cm when viewed from one side and 4 cm when viewed from the opposite side. The thickness of the slab is