If the radius of curvature of spherical mirror is 20 cm, what is its focal length?
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If the radius of curvature of spherical mirror is 20 cm, what is its focal length?

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Solution-

We know that : f = R / 2 

Radius of curvature, R = 20 cm 

So, 

f = 20 / 2 cm

f = 10 cm

Thus , the focal  length of the spherical mirror is 10 cm.

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