Question

lens ki Shakti kya hai

Answer 1

Power of lens=1/focal length.

Answer 2

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HERE'S YOUR ANSWER

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1 dioptre is the power of a lens whose focal length is 1 metre. 1D = 1m-1. You may note that the power of a convex lens is positive and that of a concave lens is negative. Optician prescribes corrective lenses indicating their powers.

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