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Q. The image of a small electric bulb fixed on the wall of a room is to be obtained on the opposite wall ma way 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=3m
Maximum focal length of the convex lens= fmax
For real images, the maximum focal length is given as:
Thus for the required purpose the maximum possible focal length of the convex lens is 0.75m
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