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Principles of reflection (203. 204).
2
03.
OF THE WAY IN WHICH THE SHADOWS CAST BY OBJECTS OUGHT TO BE
DEFINED.
If the object is the mountain here figured, and the light is at the
point a, I say that from b d and also from c f there will be
no light but from reflected rays. And this results from the fact
that rays of light can only act in straight lines; and the same is
the case with the secondary or reflected rays.
2
04.
The edges of the derived shadow are defined by the hues of the
illuminated objects surrounding the luminous body which produces the
shadow.
On reverberation.
2
05.
OF REVERBERATION.
Reverberation is caused by bodies of a bright nature with a flat and
162
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