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Illusion - Is Seeing Really Believing?
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Illusion - Is Seeing Really Believing (1998)(Marshall Media)[Mac-PC].iso
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1997-02-04
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Geometrical Optics
The parallel rows of corn yield
projections to the eye that
converge at the horizon.
What a scene looks like in a
camera obscura, on the retina,
or through a camera is a
function of geometrical optics,
the propagation and projection
of light on a surface. All that we
need to know about geometrical
optics to understand the
formation of the image derives
from two simple principles: (1)
light travels in straight lines,
and (2) the angle formed by the
two rays of light from any two
points in the scene as they
enter the eye is proportional to
the angle between the rays as
they are projected on the
retina. Thus, the size of the
image cast on the retina is
determined by the visual angle
ΓÇöΓÇôthe angle formed by the
incoming rays. How these
principles determine the
precise image formed on the
retina depends on whether or
not the object viewed is in the
frontal planeΓÇöΓÇôthat is to say, in
a plane perpendicular to the
line of sightΓÇöΓÇôand also on the
objectΓÇÖs distance.