InterviewSolution
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InterviewSolution
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The image of a small electric bulb fixed on the wall of a room is to be obtained on the opposite wall `3 m` away by means of a large convex lens. What is the maximum possible focal length of the lens required for the purpose ? |
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Answer» Correct Answer - `0.75 m` Here, distance between the object and image, `u + v = 3 m` focal length of lens, `f = ?` As maximum distance between an object and image in case of convex lens `= 4 f`, `4 f = 3 m, f = 3/4 = 0.75 m`. |
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