Question

A convex lens is moved towards a stationary point object (on principle axis) with a speed
. The screen is moved to catch the image. At an instant the size of image is
that of object, then the speed of screen at this instant is​

Answer 1

Answer:

A double convex lens forms a real image of an object on a screen which is fixed. Now the lens is given a constant velocity along its axis and away from the screen. For the purpose of forming the image always on the screen, the object is also required to be given an appropriate velocity. Find the velocity of the object at the instant its size is n times the size of image.(Take and m/s).