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The radius of curvature of a spherical m...

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

A

`10 cm`

B

`20 cm`

C

`40 cm`

D

`80 cm`

Text Solution

Verified by Experts

The correct Answer is:
A
We know that : `f=R/2`
`"Here, Forcal length , f=? "("To be calculated")`
And, Radius of curavature, R=20 cm
`"SO, " f=(20)/2cm`
=10 m
Thus, the focal length of this spherical mirror is 10 cm.
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