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A teacher sets up the stand carrying a convex lens of focal length 15 cm at 42.7 cm mark on the optical bench. He asks four students A, B, C and D to suggest the position of screen on the optical bench so that a distinct image of a distant tree is obtained almost immediately on it. The positions suggested by the students were as : (A) 12.7 cm (B) 29.7 cm (C) 57.7 cm (D) 72.7 cm. The correct position of the screen was suggested by :a) A b) B c) C d) D |
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Answer» option AExplanation:in CONVEX LENS the position of the IMAGE always will be LESS than the focal LENGTH. so option A is correct which is 12.7cm(less than focal length). |
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