EASY
12th West Bengal Board
IMPORTANT
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To get a real image of same size as the object by a convex lens, the object distance should be
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Important Questions on Refraction at Spherical Surfaces and Spherical Lens
EASY
12th West Bengal Board
IMPORTANT
A concave lens of r.i is immersed in a medium whose refractive index is more than If a parallel beam of light fall on the lens, the emergent beam will be
EASY
12th West Bengal Board
IMPORTANT
A concave lens of r.i is immersed in a medium of r.i. If a parallel beam of light falls on the lens, the emergent beam will be
MEDIUM
12th West Bengal Board
IMPORTANT
A converging beam of rays tries to converge at a point behind a convex lens. But before that the rays are refracted by the lens. If the focal length of the lens is , the image will be formed at
EASY
12th West Bengal Board
IMPORTANT
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 Plano-convex lens of r.i. and radius of curvature 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
The distance between an object and a divergent lens is times the focal length of the lens. The linear magnification produced by the lens is
EASY
12th West Bengal Board
IMPORTANT
An object is situated at a distance of from a convex lens of focal length . The position of the image is
EASY
12th West Bengal Board
IMPORTANT
The distance between the object and the screen is . Real images of an object are formed on the screen for two positions of a lens separated by a distance . The ratio between the sizes of the images will be
