- Mar 21, 2005
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The laws are complicated, but they work.I am not only insane, I am also reading the christian bible each and every day. It is the patterns of the rainbow making me marvel, and can't understand how laws of physics create it. To me physical explination of the rainbow is pure nonsense. But you can always try to talk sense to me...
Imagine you're standing in a wide field. The Sun is behind you, and a sheet of rain is in front of you (you're basically on the boundary of the rain). It's light is streaming from behind your head to your front.
Raindrops are spherical. When light enters them, it refracts off the back and comes back out the front again - the raindrops act like little mirrors. But, they don't reflect it back perfectly, they do it like so:
In reality, there would be incident rays (that is, rays of light coming from the Sun) hitting from the top to the bottom of the raindrop. But, for simplicity, only half the rays are shown - those that come in to the top half of the raindrop. When the rays hit the back, they bounce around in that complicated way and then stream outwards.
When this happens to many raindrops at once, they basically end up turning the light from the Sun back around, and spreading it outwards in a cone. This separates the light according to its wavelength, and so we see a circle of light appear in the sky. Since the circle is centred on the ground, we only see the top half - the rainbow.
Does that make sense?
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