ANSWERS: 1
  • Well, there are generally three ways these could work, but in practice, I think they only work in two ways: 1) They selectively reflect or scatter the UV light 2) They selectively absorb UV light 3) They absorb and re-emit the light on another safer wavelength (fluoresce) All sunscreens I've heard of do some combination of 1 and 2. More info here: http://en.wikipedia.org/wiki/Sunscreen

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