Published on Fri Feb 20 12:04:17 UTC 2015
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Question - (a) What is meant by 'power of a lens'?
(b) State and define the SI unit of power of a lens.
(c) A convex lens of focal length 25 cm and a concave lens of focal length 10 cm are placed in close contact with each other. Calculate the lens power of this combination.
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