Question

the radius of curvature of a spherical mirror is 20 cm . what is it's focal length ?

Answer 1

Answer:

C=2F

2×20=40cm

Explanation:

radius of curvature is duble of focal length

Answer 2

Answer:

Explanation:

Radius of curvature = 2 × focal length

so, focal length = $\frac{1}{2}$ × radius of curvature

                       = $\frac{1}{2}$ × 20 cm

                       = 20 cm Ans