There are many factors that people take into account when choosing which sunscreen to use. Two of the most important factors that people consider are the ability to block UV light and how the sunscreen appears on the skin (due to the interaction with visible light). You are about to see three animations that are models of what happens when sunlight (UV and visible rays) shines on:

• Skin without any sunscreen

• Skin protected by 200 nm ZnO particle sunscreen

• Skin protected by 30 nm ZnO particle sunscreen

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