A bulb is located on a wall. Its image is to be obtained on a parallel wall with the help of convex lens. The lens is placed at a distance d ahead of second wall, then required focal length will be
only ${d \over 4}$
only ${d \over 2}$
more than ${d \over 4}$ but less than ${d \over 2}$
less than ${d \over 4}$
Solution
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