Question

define power of lens.when is the power of lens positive​

Answer 1

The power of a lens is defined as the ability of the lens to converge or diverge a beam of light falling on it. ... The power of a convex lens is positive as a convex lens has a positive focal length, while the power of a concave lens is negative as concave lens has a negative focal length.

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Answer 2

Answer:

Power of lens is the ability to converge or diverge the rays of light while passing through the lens. It is positive for Convex lens. It is negative for Concave lens. ... One diopter is defined as power when focal length of the lens is one meter.