In a autocollimation experiment a thin convex lens is, Ask an Expert

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In a autocollimation experiment, a thin convex lens is placed 25 cm from a pinhole that acts as a point source of light. A plane mirror placed 20 cm behind the lens reflects the light back through the lens, and the reflected light forms a sharp spot beside the pinhole.

What is the focal length of the lens (in cm)?

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Reference No.:- M91008142

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