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Define 1 dioptre of power of lens?????Plzzzz help...​

Answer»

1 dioptre is SI unit of the power of a lens WHOSE focal LENGTH is 1 METRE. It is denoted by the letter D. Thus 1D = 1 m-1. Simply, when focal length ‘ f ‘ is EXPRESSED in METRES, then, power is expressed in dioptres. The power of a convex lens is positive and that of a concave lens is negative



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