eli5: How does sun screen work AND what/why is the difference in efficacy between Zinc-based and common sunscreens?

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eli5: How does sun screen work AND what/why is the difference in efficacy between Zinc-based and common sunscreens?

In: Physics

Sunscreen is skin paint that’s opaque in the UV spectrum. Some as clear in the visible spectrum others are white in the visible spectrum, like Zinc oxide.