I read that windows block majority of sun radiation, some even claimed that windows block almost 100% of UVB, but I found no reliable sources on windows blocking UVA. I guess it is due to the wavelength and UVA having longer wavelength means they penetrate deeper, but why is that so ?
Edit: I formulated my question poorly, instead I should’ve asked: what prevents us from creating windows that block UVA rays?
In: 2
UVA and UVB are different wavelengths. It’s the same reason things have colors. Different materials absorb, reflect, or allow through different wavelengths of light. We see different colors in the visible light range, but the same principle still applies for nonvisible light.
It’s like how the old blue and red 3D movies worked. You have a blue lens and a red lens, and the movie is projected with blue light and red light, so only the blue light goes through the blue lens, and only the red light goes through the red lens. Glass is just a lens that let’s through visible light and UVA.
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