The radius of curvature of a spherical mirror is 20 cm. What is its focal length?
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Solution
Radius of curvature, R= 20 cm
Radius of curvature of a spherical mirror = 2 × Focal length (f)R= 2f
f= R/2 = 20 / 2 = 10
Hence, the focal length of the given spherical mirror is 10 cm.
Concept: Concave Mirror
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