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sunburn comes from receiving too much infra-red rays directly from the Sun (lying in direct sunlight).

Infra-red rays are long wave length, and the longer the wavelength the more penetrating, they can pass through denser/thicker matter. However, the upper atmosphere, the ozone layer, stops a lot of infra-red waves reaching the Earth, but not all. So in lying in direct sunlight, IR waves are passing through you, hence burning.

In comparison ultra-violet (UV) waves are shorter wavelength and less penetrating, but more damaging to the surface they pass through.

If you are mind full of having a nice Sun-tan . The best advise is sit in the shade, with a cold drink alongside you. You will receive all the UV light that you need for a good sun-tan, but will not be sun-burnt.

Yes!!! it seems a bit obtuse, but it works, and it was the advice I was given many years ago by a doctor, and ??? you don't need sunscreens/creams????

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lenpollock

Lvl 17
1mo ago

What else can I help you with?