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Q1: The power of a lens

A is reciprocal of its focal length

B is positive if it is a convex lens

C is negative if it is a concave lens

D is measured in diopter.

ANS:D - is measured in diopter.

The focal length f is positive for converging lenses and negative for diverging lenses. The reciprocal of the focal length, 1/f, is the optical power of the lens. If the focal length is in meters, this gives the optical power in dioptres (inverse meters).



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