a kind of picture of theobject — an image. To illustrate, try the following : — Experiment 63. — Cut a hole about an inch square in the bottom ofa chalk box and paste over it a piece of tinfoil which has a pinhole inthe middle of it. Cover the top of the box with oiled white paper, then hold the… … Fig. 57. Shadows. — By placing abook between a lamp flameand the wall light is excluded from a space between thebook and wall. This space is called a shadow. We notice,more or less clearly defined, a dark area on the wall thesame in outline as the book, but this area is not theshadow, it is only a…
Physics
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