Hall, Edwin Herbert, 1855-1938 · New York, H. Holt and company · leaf 131
ge of the arrow. 118. Principal Focus of Concave Mirror.—Tlie principalfocus of a concave mirror is the point to ivhich rays, comingto the mirror parallel to the principal axis, converge afterreflection. In other words, it is the point which marks theimage (real) of a very distant point on the…
Physics
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