1.

An object is moving towards a concave mirror of focal length 24 cm. When it is at a distance of 60 cm from the mirror its speed is 9 cm/s. The speed of its image at the instant is

A. 4 cm/s towards the mirror
B. 9 cm/s towards the mirror
C. 4 cm/s away from the mirror
D. 9 cm/s away from the mirror
Answer» D. 9 cm/s away from the mirror


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