Question:
The radius of curvature of a concave mirror of focal length 20 cm is:
The radius of curvature of a concave mirror of focal length 20 cm is:
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For concave and convex mirrors, the focal length is half the radius of curvature.
Updated On: Oct 27, 2025
- 15 cm
- 10 cm
- 40 cm
- 60 cm \bigskip
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The Correct Option is C
Solution and Explanation
The relationship between the focal length \( f \) and radius of curvature \( R \) is \( R = 2f \). Therefore, for \( f = 20 \) cm, \( R = 40 \) cm.
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