When i was a kid, i always get amused when i saw the holograms and the red, blue, green etc colors on it, and i though where are they come from and also when i see the criled cds/dvd, it always strike me, that where does this colors come on it.
Today while reading the book QED by Dr. Richard P Feynman, i came to know that these are the effects due the grating or diffraction grating.
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