I just saw the new video by It’s Okay To Be Smart (https://youtu.be/FnDP1sjKGfU) and got confused when he said that glass is opaque to the UV light. If it is in fact UV light repellent, why are you still able to get tanned when exposed to the sunlight for example through a car side window?
In: Physics
Not every window perfectly repels UV, also depends on where the sun is in the sky. When the sun is low, photons have to slug through more atmosphere to reach you, so if you’re trying to avoid a tan, stay inside during the middle of the day
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