Hart, C. A. (Clara Avis), b. 1863, Feldman, Daniel D., b. 1872 · New York, American Book Co · leaf 71
. This exercise illustrates the lawby which light is reflected from amirror. The light from the object,P, is reflected and appears to comefrom L, as far behind the mirror as P is in front of it. Ex. 176. If from any point within a triangle lines are drawnto the extremities of any side of the… … 171. Note to Teacher. Up to this point all proofs given havebeen complete, including argument and reasons. In writtenwork it is frequently convenient, however, to have studentsgive the argument only. These two forms will be distinguishedby calling the former a complete demonstration and the…
Geometry, Plane · Geometry, Solid
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