SSC
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The radius of curvature of a mirror is 20cm the focal length is
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20 cm
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10 cm
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40 cm
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5 cm
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Explanation:
Detailed explanation-1: -So, focal length = 21× radius of curvature = 21×20 cm = 10 cm.
Detailed explanation-2: -For concave mirror f=2R=2−20=−10 cm.
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