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friend and d your own eye. Your friend's eye will appear to you at
a, and to him it will seem that yours is at c, and the
intersection of the visual rays will occur at m, so that either of
you touching m will touch the eye of the other man which shall be
open. And if you touch the eye of the other man in the mirror it
will seem to him that you are touching your own.
Appendix:--On shadows in movement (211. 212).
2
11.
OF THE SHADOW AND ITS MOTION.
When two bodies casting shadows, and one in front of the other, are
between a window and the wall with some space between them, the
shadow of the body which is nearest to the plane of the wall will
move if the body nearest to the window is put in transverse motion
across the window. To prove this let a and b be two bodies
placed between the window n m and the plane surface o p with
sufficient space between them as shown by the space a b. I say
that if the body a is moved towards s the shadow of the body b
which is at c will move towards d.
2
12.
OF THE MOTION OF SHADOWS.
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