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
Some glass is treated to absorb tons of UV, while other glass does allow a bit of UV through. You may get a tan after sitting next to a glass window for 4 hours, but you would get a similar tan out in direct sunlight without sunscreen in a few minutes.
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