Define 1 D of power of a lens.
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Explanation:
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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Answer:
1D of lens is the reciprocal of its focal length in metres
1D=1/1m
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