a convex lens has focal length + 20 CM its power is
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power = 1/f = 1/20 = 0.05m
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heya...
Power of the lens is Diopters (D) is the reciprocal of focal length in meters.
So power=1/.2=5D
Power of the lens is Diopters (D) is the reciprocal of focal length in meters.
So power=1/.2=5D
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