Question

the radius of curvature of a spherical mirror is 20 cm what is it focallength​

Answer 1

f = R/2

f = 20/2

f= 10 cm

hope it helps you

Answer 2

R =20 cm

F=R/2

we want to find the focal length

So , formula =, F= R/2

Radius is given as 20 cm

So substiting the values

As F= 20/2.

The answer = 10 cm

Focal length is 10 cm

Thank you