First slide
The lens

In the diagram shown, the lens is moving towards the object with a velocity V m/s and the object is also moving towards the lens with the same speed. What is speed of the image with respect to earth when the object is at a distance 2f from the lens? 

(f is the focal length):


Vil=vu2Vo/l ViVl=+2f2f2V0Vl Vi(V)=(1)2[V(V)]  Vi=V

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