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An object is 20 cm away from a concave m...

An object is 20 cm away from a concave mirror of focal length, 15 cm. If the object moves with a speed of 5 m/s along the axis, then the instantaneous speed of image will be

A

30 m/s

B

45 m/s

C

9 m/s

D

18 m/s

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