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A double convex lens forms a real image ...

A double convex lens forms a real image of an objectt on a screen which is fixed. Now lens is given a constant velocity v=1m/s along its axis and away from the screen for the purpose of forming image always on the screen the object is also required to be given appropriate velocity . Find the velocity (in m/s) of the object at the instant its size is doubled the size of the image.

A

1 m/s

B

2 m/s

C

3 m/s

D

4 m/s

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The correct Answer is:
B
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