A high-school astronomy: in which the descriptive, physical, and practical are combined .. (1859)
Mattison, Hiram, 1811-1868 · New York, Mason brothers · leaf 224
REFLECTION OF LIGHT. 219 506. A concave mirror reflects parallel rays back to afocus, the distance of which is equal to half the radiusof the sphere formed by the concave surface produced. REFLECTION BY A CONCAVE MIEROR. … In this cut, the parallel rays A fall upon the concave mirror BB, and are reflected tothe focus C, which is half the radius of the sphere formed by the surface of the imrrorproduced. If, therefore, it was desirable to construct a.concave mirror, having its jouis10 feet distant, it would only be…
Astronomy
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