What is meant by power of lens write its si unit a student uses a lens of focal length 40 cm?
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The reciprocal of the focal length of a lens is termed as power of a lens.
Power= 1/ Focal length
SI unit of power is Dioptre.
Focal length +40 cm of a lens tells that it is convex lens as its focal length is in positive =p=1/f=100/40=+2.5D
Hope it helps :)
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