Divergent Rays in a Concave Mirror

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“...be made obvious...where the diverging rays 1, 2, 3, 4 form a focus at the point o, whereas, had they been parallel, their focus would have been at a.” -Comstock 1850

Source

J. L. Comstock A System of Natural Philosophy: Principles of Mechanics (: Pratt, Woodford, and Company, 1850) 229

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