Rays Diverging from Beyond the Center of Curvature on a Concave Mirror

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“When the rays diverge form a point at a distance from the mirror less than that of the principal focus, the reflected rays diverge as if from a point back of the mirrir. This point, b, is a virtual focus.” -Avery 1895


Elroy M. Avery School Physics (New York: Sheldon and Company, 1895) 335


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