Suppose that we replace the parabolic mirror of by a
Chapter , Problem 23(choose chapter or problem)
Suppose that we replace the parabolic mirror of by a spherical mirror. Although the mirror has no focus, we can show the existence of an approximate focus. In the figure, C is a semicircle with center O. A ray of light coming in toward the mirror parallel to the axis along the line PQ will be reflected to the point R on the axis so that /PQO /OQR (the angle of incidence is equal to the angle of reflection). What happens to the point R as P is taken closer and closer to the axis?
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