define power of focal lens calculate the power of lens whose focal length is 2m
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The power of a lens is defined as the reciprocal of its focal length in metres, or P=f1, where P is the power in diopters and f is the focal length in metres.
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the power can be defined as the reciprocal of focal length
so , p=1/f
=1/2
= 0.5 D
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