Find the power of a concave lens of focal length 2 m.



Since focal length of concave lens is negative

Focal length = 2m

We know that,

Power of a lens = 1/Focal Length

                          = 1/( 2) 

                          = 0.5 D


Power of a concave lens is 0.5 D

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CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo