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  • 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

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

Option: 1

5cm/sec towards the mirror


Option: 2

4cm/sec towards the mirror


Option: 3

4cm/sec away from the mirror


Option: 4

9cm/sec away from the mirror


Answers (1)

best_answer

v_{i}=-\left(\frac{f}{f-u}\right)^{2} \cdot v_{o}=-\left(\frac{-24}{-24-(-60)}\right)^{2} \times 9=-4 \mathrm{cm} / \mathrm{sec}

Posted by

jitender.kumar

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