To focus a camera on objects at different distances, the converging lens is moved toward or away from the film, so a sharp image always falls on the film. A camera with a telephoto lens (f = 200.0 mm) is to be focused on an object located first at a distance of 3.5 m and then at 50.0 m. Over what distance must the lens be movable?

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Xyle1991 · Accepted Answer

Step 1&amp;nbsp;From the thin lens equation,&amp;nbsp;1d0+1di=1f&amp;nbsp;the distance(d0)&amp;nbsp;the distance between the lens and the picture sensordi=d0fd0−f&amp;nbsp;At first the object is at a distance of 3.5 m. The image distance is thereforedi=3.5×0.23.5−0.2=0.212m&amp;nbsp;So the lens is movable over a distanse of (0.212-0.201)0.011 m=11 mm&amp;nbsp;Answer&amp;nbsp;11 mm

To focus a camera on objects at different distances, the converging lens is move

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