Question

what will be the power of convex lens of focal length 50cm what if the lens is concave?​

Answer 1

Answer -> -2D

Explanation-

The power of a lens is 1/focal length (measured in meters). So, 50 cm is 1/2 meter, so the power is -2; D stands for diopters, the unit of power for lenses. Hence, the power of a concave lens of focal length 50 cm is -2D.

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