Question

what is meant by the power of a lens? what is its SI unit name the type of lens whose power is positive

Answer 1

Power of lens is the ability of the lensto converge the rays of light falling on it. Definition: The power of a lens is the reciprocal of its focal length in meters. When, f = 1 m, P = 1/f = 1/1 = 1 dioptre. 1 dioptre is the power of a lens whose focal length is 1 meter.

Answer 2

The ability to converge and diverge light rays depends upon its focsl lenth is called power of lens. Its si unit is D. (Dioptre) posite power= convex lens and negitive is of concave lens.
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