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.

Hi Mahima! 

Power of a lens is defined as the reciprocal of focal-length. Its SI unit is Diopter (D), which is actually reciprocal of 1 meter. 

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plz help in some difficult question??????

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Power is the ability of lens to converge or diverge a ray of light

Power is also known as the reciprocal of focal length(f)

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