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2016-01-08 20:35:53 Post No. 7770289
Post No. 7770289
My understanding of clear materials is that they allow all lower photon energies to pass through due to the energy gap.
This makes sense for UV proof glass, it blocks higher energy photons.
What I dont understand is how a material can only let a certain range of photons through, like most of the visible range but no infrared, because that means its blocking a lower energy level and allowing a higher energy level which doesnt make sense to me if the energy gap between electrons is what causes transparency.
Pic related because it was probably taken with an IR filter.