Hawkins, Victor Dean, 1875- · New York [etc.] Longmans, Green, and co. · leaf 110
FiG 70. FIG. 71. Optical disk, showing reflection of light in mirrors. The concave mirror focuses parallel rays at a point calledthe principle focus (Fig. 70). The convex mirror tends todiverge light reflected from its surface (Fig. 71). APPLIED PHYSICS
Physics
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