Diffraction
When a wave train passes an obstacle secondary waves are set up that interfere with the primary wave and give rise to bands of constructive and destructive interference. Around a point source of light, in consequence, is a series of concentric light and dark bands (coloured bands with white light), a diffraction pattern.
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Darwin's Finches are an example of natural selection in action. They are an excellent example of the way species' gene p..
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