why is glass prism used for scatering of light and not glass slab?
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Glass prism is used for scatering of light not glass slab because Because white light is made up of ALL visible wavelengths, its colors can be separated (dispersed) by this difference in behavior. When lightpasses through glass, it encounters TWO interfaces--one entering and the other leaving. It slows down at the first interface and speeds back up at the second.
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