Consider a spherical (say concave) mirror. Let an object be placed beyond its focus so that a real image is formed on reflection. The location of the image is found by considering a point on the object as a point source, drawing a couple of light rays from it, and finding their point of intersection on reflection.
My question is how do we know that all the other infinite light rays that can be drawn from the point source will also intersect at that same point on reflection?
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