Question

define power of a lens. The power of a lens used in a reading glass of a person is +1D.What is the nature of the lens?

Answer 1

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The power of a lens characterises the converging or diverging properties of a lens and is defined as the reciprocal of its focal length in metres.

The nature of lens the person using is convex.

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Answer 2

Power of a lens is simply
defined as the ablity of a lens to converge or diverge light.
 The lens used here is a convex lens.