What is the power of convex lens whose focal length is 25cm?
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25 cm. focal length (0.25 meters) has a power of 4 diopters. If the focal length of the biconvex lens is 25cm, then the power of the lens will be? A concave lens is kept in contact with a convex lens of a focal length of 20cm. The combination works as a converging lens of a focal length of 100cm
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