The radius of curvature of a spherical mirror is 20 cm. What is its focal length? 



Radius of curvature = 20 cm


We know that

Focal length is equal to half of Radius of curvature



Focal length = Radius of curvature / 2

                   = 20/2

                   = 10 cm


The focal length is 10 cm

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CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo