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Reflection of Light

Assertion :We...

Question

Assertion :We cannot produce a real image by plane or convex mirrors under any circumstances. Reason: If image distance of a real object in front of a convex mirror is taken as negative, then the focal length of a convex mirror is taken as positive.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is D Assertion is incorrect but Reason is correct
There are a number of ways to obtain a real image from plane and convex mirrors. Best counter example has been shown in the attached figures where mirrors form a real image I of a virtual object O.
According to sign convention, distances measured in the direction of light are taken as positive. Hence, focal length of convex mirror is positive.

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