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When you look at a CD at a certain angle, why can you see rainbow colors?
Obviously it's cause of a reflection of some sort, but there is no "rainbow" around me...I've always been curious about this 
learn about "diffraction patterns"
interaction of waves with repeated things on the order of the wavelength
angle of view is important
CD is like a grating not a crystal
Three Six Mafia ft. Lil Flip - Rainbow Colors