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A spherical mirror has a radius of curvature of 30 cm. Its focal length is
A30 cm
B60 cm
C15 cm
D7.5 cm
Answer & Solution
Correct answer: C. 15 cm
1. For a spherical mirror R = 2f, so f = R/2.
2. Substitute R = 30 cm.
3. f = 30/2 = 15 cm.
_Source: AP/TS SCERT Class 10 Physical Science, "Reflection of Light at Curved Surfaces"_
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