Question

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

Answer 1

Answer:

10cm

Explanation:

R = 2f

20 = 2f

20/2 = f

10cm = f

Answer 2

Answer:

Focal length,  $f = \frac{R}{2} = \frac{20}{2} = 10\ cm$