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2
27.
If you place an opaque object in front of your eye at a distance of
four fingers' breadth, if it is smaller than the space between the
two eyes it will not interfere with your seeing any thing that may
be beyond it. No object situated beyond another object seen by the
eye can be concealed by this [nearer] object if it is smaller than
the space from eye to eye.
2
28.
The eye cannot take in a luminous angle which is too close to it.
2
29.
That part of a surface will be better lighted on which the light
falls at the greater angle. And that part, on which the shadow falls
at the greatest angle, will receive from those rays least of the
benefit of the light.
2
30.
OF THE EYE.
The edges of an object placed in front of the pupil of the eye will
be less distinct in proportion as they are closer to the eye. This
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