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In the diagram below, M is a plane mirror, B is a very small bulb that can be treated as a point source, and P is an opaque plate that does not transmit light.   O is a line anywhere along which an observer can stand to try to see the image of the light bulb in the mirror. By using relevant rays of light, determine the locations along line O from which the image of B is visible in the mirror and the locations from which it is not visible.   Mark these regions accordingly along line O and explain your reasoning.

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Page last modified April 17, 2008: OP33