The radius of curvature of a concave mirror is 20 cm. Its focal length will be
(i) - 20 cm
(ii) - 10 cm
(iii) + 40 cm
(iv) +10 cm
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2
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So, focal length = 21× radius of curvature = 21×20 cm = 10 cm.
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3 answer right away hii friends
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