1.

A point object is moving on the principal axis of a concave mirror of focal length \[24cm\] towards the mirror. When it is at a distance of \[60cm\] from the mirror, its velocity is \[9cm/sec.\] What is the velocity of the image at that instant [MP PMT 1997]

A.            \[5cm/sec\] towards the mirror
B.            \[4cm/sec\] towards the mirror
C.            \[4cm/sec\] away from the mirror
D.            \[9cm/\sec \] away from the mirror
Answer» D.            \[9cm/\sec \] away from the mirror


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