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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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.