Question

The radius of curvature of a sherical mirror is 20m what is focal length

Answer 1

Answer:

the focal length will be 10cm

Explanation:

the relation between focal length and radius is

2f=R

(twice of focal length = radius)

2f = 20 cm (given)

f = 20/2

f = 10 cm

hence proved.

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Answer 2

Explanation:

We know that ,

Radius of curvature=2×focal length

R=2F so,F=R/2

F=20/2

=10m

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