Assertion :If radius of curvature of a mirror is doubled, its focal length is halved. Reason: Radius of curvature=2 times the focal length.
A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Assertion is incorrect but Reason is correct
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Solution
The correct option is D Assertion is incorrect but Reason is correct
The relation between focal length(f) and radius of curveture(R).
We have f=R2 where f is the focal length and R is the Radius of curvature. ⟹f∝R. Hence if radius of curvature of a mirror is doubled, its focal length is double.