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Assertion (A) : Radius of curvature of a concave mirror is 20 cm. If a real object is placed at 10cm from pole of the mirror, image is formed at infinity.
Reason (R) : When object is placed at focus, its image is formed at infinity

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Both A and R are true but R is not the correct explanation of the A.

Both A and R are true and R is the correct explanation of the A

A is incorrect, but R is correct

A is correct, but R is incorrect

answer is A.

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Detailed Solution

$R = 20 c m, u = 10 c m, f = 10 c m$

$\frac{1}{f} = \frac{1}{u} + \frac{1}{v} \Rightarrow \frac{1}{v} = \frac{1}{10} - \frac{1}{10} = 0$ $v = \propto$

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