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greater angle which will be a m q; and the pyramid b p m will be
narrower and m o c will be still finer, and so on by degrees, in
proportion as they are nearer to e, the pyramids will become
narrower and darker. That portion of the wall will be the darkest
where the breadth of the pyramid of shadow is greater than the
breadth of the pyramid of light.
At the point a the pyramid of light is equal in strength to the
pyramid of shadow, because the base f g is equal to the base r
f. At the point d the pyramid of light is narrower than the
pyramid of shadow by so much as the base s f is less than the base
f g.
Divide the foregoing proposition into two diagrams, one with the
pyramids of light and shadow, the other with the pyramids of light
[only].
2
61.
Among shadows of equal depth those which are nearest to the eye will
look least deep.
2
62.
The more brilliant the light given by a luminous body, the deeper
will the shadows be cast by the objects it illuminates.
195
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