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This photo was taken through the
windshield of my car during a snowstorm. Looking through the melting
snow and water running down the windshield distorts the view just
enough to be interesting, yet the winter trees are still recognizable.
The distortion occurs because of refraction. Light travels through
a liquid or solid at a slower rate than it does through our atmosphere.
With a windshield of uniform thickness there's virtually no distortion
because light moves through all the glass at the same rate.
With melting snow and water on the windshield the thickness of of
glass plus liquid that light must pass through is not consistent.
The light is 'bent' much like a lens does to enlarge or reduce. Unlike
a camera lens the water creates a very random distortion because of
the irregular surface. |
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