Question:
The image of a small electric bulb fixed on the wall of a room is to be obtained on the opposite wall 3m away by means of a large convex lens. What is the maximum possible focal length of the lens required for the purpose?
Answer:
Distance between the object and the image (d) = 3 m
Maximum focal length of the convex lens = fmax
Thus for real image
fmax = d/4 = 3/4 = 0.75 m
Hence, 0.75 m is the maximum possible focal length of the lens required for the purpose.
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