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 
ahead of second wall, then required focal length will be
but less than 
.
Text Solution
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: A real image is to be formed on the 
wall of the bulb placed on the first wall by the convex lens. The lens is placed at a distance of d from the 
wall.
Now, we know that to form a real image of an object on a screen by a convex lens, the distance between the source and the screen ( D ) should be equal to 
, where 
is the focal length of the lens.
In that case, 
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