Question

The radius of curvature of a spherical mirror is 20 cm. What is its focal length?
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Answer 1

Answer

Radius of curvature, R= 20 cm

Radius of curvature of a spherical mirror = 2 × Focal length (f)R= 2f

f= R/2 = 20 / 2 = 10

Hence, the focal length of the given spherical mirror is 10 cm.

Answer 2

Answer:

Explanation:

Given

Where R=20,F=..........

R=2F

20=2F

Therefore F=10