Assertion : In a concave mirror if X and Y are the distance of the oject and its image respectively from the focus then the focal length of the mirror is `sqrt(xy)`
Reason : In above case `(1)/(v ) + (1)(u) + (1)/(f )` reduces to `(1)/( f+ x) + (1)/(f+ y) = (1)/(f ) rArr xy = f^(2)`

Options

A. If both Assertion & Reason are True & Reason is a correct explanation of the Assertion.
B. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion.
C. If Assertion is True but the Reason is False.
D. If both Assertion & Reason are False.

Answer

A