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Q.

The radius of curvature of a spherical mirror is 20 cm , focal length will be [[1]].


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Detailed Solution

The radius of curvature of a spherical mirror is 20 cm , focal length will be 10 cm Given:
Radius of curvature (R) = 20 cm
Radius of curvature of the spherical mirror = 2 × Focal length (F)
                                                                           ⇒  R = 2F
                                                                           ⇒ F=R2
                                                                           ⇒ F= 202 
                                                                            ∴ F= 10 cm
 
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