Define power of lens.In what SI unit is power of lenses rated?A convex lens has a focal length of 50cm.calculate its power.
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Power of a lens is defined as the reciprocal of its focal length. SI unit of power is dioptre.
Focal length of convex lens = +50cm = 0.50cm
Power = 100/50= 2 = + 0.2 D
Focal length of convex lens = +50cm = 0.50cm
Power = 100/50= 2 = + 0.2 D
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