Carhart, Henry S. (Henry Smith), 1844-1920 · Boston : Allyn and Bacon · leaf 242
lyor in part cut off by an opaque body. If the body is in thevicinity of a luminous point its illuminated area is limitedby the curve of contact of a cone starting from the pointand circumscribed about the opaque body AB (Fig. 98).The portion of the space within this cone of shadow andbeyond the…
Physics
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