EASY
12th West Bengal Board
IMPORTANT
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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,
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Important Questions on Refraction at Spherical Surfaces and Spherical Lens
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
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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
EASY
12th West Bengal Board
IMPORTANT
Inside water, an air bubble behaves
MEDIUM
12th West Bengal Board
IMPORTANT
An air bubble inside a glass slab appears at when viewed from one side and when viewed from the opposite side. The thickness of the slab is
EASY
12th West Bengal Board
IMPORTANT
A thin glass lens has optical power of in air. Its optical power in a liquid medium with will be
EASY
12th West Bengal Board
IMPORTANT
When monochromatic red light is used instead of blue light is incident in a convex lens, its focal length will
