Hawkins, Victor Dean, 1875- · New York [etc.] Longmans, Green, and co. · leaf 111
FIG. 74. FIG. 75. Optical disk, showing effect of refraction of light. Rays of light parallel to the principle axis of a convexlens meet at the principle focus (Fig. 74). Rays of lightdiverging from a distance equal to the focal length upon aconvex lens, leave as parallel rays (Fig. 75). LIGHT 97
Physics
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