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Relationship between Focus and Radius of Curvature

The focal len...

Question

The focal length of a spherical mirror of radius of curvature 30 cm is:

(a) 10 cm
(b) 15 cm
(c) 20 cm
(d) 30 cm

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Solution

(b) 15 cm
The focal length of a spherical mirror is half of its radius of curvature.

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