Why can you see through water? (From a real 4 y.o.)
In: Physics
Because the energy of visible light doesn’t match the energy levels of the electrons around the molecules. Since you can’t split the energy of a photon in two, there needs to be a match in energy for any interaction/absorption to take place. It’s like trying to purchase something for $50, but you only have a $100 note and the cashier doesn’t have any change (and assuming you’re not allowed to overpay :).
Since no interaction can take place, the light just moves along and the object is perceived as transparent.
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