In the autocollimation experiment of sec. 3.5, 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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In the autocollimation experiment of sec. 3.5, a thin convex lens is placed 25 cm from a pinhole tha...
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