Question

the radius of curvature of a spherical mirror is 20cm. what is its focal length?​

Answer 1

Answer:

10 cm

Explanation:

f = c/2  where c = 20

f = 20/2

f = 10 cm

Answer 2

We know that Radius of Curvature is always double of the focal length and the focal length is twice the radius of curvature.

C = 2 × F

C = Radius of Curvature

F = Focal Length

In the Given Question, we have :-

The Radius of curvature is 20cm

C = 2F

=> F = C/2

=> F = 20/2

=> F = 10cm

Hence we calculated the Focal Length as 10cm