Convergent Rays in a Concave Mirror

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“Thus, were the rays falling on the mirror parallel, the focus would be at a’ but in consequence of their previous convergency, they are brought together at a less distance than the principal focus.” -Comstock 1850


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


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