Question

What do you mean by power of lene? How idoes it depend upon the focal length} helal the meaning of positive and negative powers!​

Answer 1

power of lens is the reciprocal of focal length. if power of lens increases focal length decreases. therefore, if focal length is positive then power of lens is negative and when focal length is negative power of lens is positive. e3radg8 and 16 more users found this answer helpful.

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