Volume Volume1\Light and Shade\Book1
Entry# 137. Experiments on the relation of light and shadow within a room (137--140).
Contents: Vol. 1 | Vol. 2
SHOWS HOW LIGHT FROM ANY SIDE CONVERGES TO ONE POINT.
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_.
Footnote: The diagram belonging to this passage is slightly
sketched on Pl. XXXII; a square with three balls below it. The first
three lines of the text belonging to it are written above the sketch
and the six others below it.
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