An object moves toward a stationary concave mirror at 2 cm/s. At an instant its real image moves away from the mirror at 18 cm/s. The magnitude of transverse magnification at that instant is:
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An object moves toward a stationary concave mirror at 2 cm/s. At an instant its real image moves away from the mirror at 18 cm/s. The magnitude of transverse magnification at that instant is:

G1 Physics · Accepted Answer

Axial speed ratio=(v/u)²=18/2=9, so |v/u|=3 and |m|=3.