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Question -

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



Answer -

Radius of curvature (R) = 20 cm
Radius of curvature of the spherical mirror = 2 ├Ч Focal length (f)
R = 2f
f= R/2 = 20 / 2 = 10
Therefore, the focal length of the spherical mirror is 10 cm.

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