Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
tors.—TJie surface of the concavemirror, like that of the convex. Fig. 13(381), nuiy be considered as made up ofsmall plane mirrors. Concave mirrorsrender parallel rays convergent, insteadof divergent; and convergent rays moreconvergent, instead of less; and divergentrays less, instead of more…
Physics · Astronomy
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