Answers

2016-03-05T21:57:35+05:30
Power of a lens is its ability to bend light .
SI unit for optical power is the inverse metre (m−1) also known as dioptre.
Converging lenses have positive optical power.
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2016-03-05T22:01:21+05:30
Power of lens is reciprocal of its focal length

P=1/f

si unit is dioptre

covex lens has power always positive
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