III. Six Books on Light and Shade: 137.
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III. Six Books on Light and Shade: 137.
137.
SHOWS HOW LIGHT FROM ANY SIDE CONVERGES TO ONE POINT.
Experiments on the relation of light and shadow within a room (137--140).Although the balls a b c are lighted from one window, nevertheless, if you follow the lines of their shadows you will see they intersect at a point forming the angle n.
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