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Permalink Submitted by Anonymous (not verified) on 23 April, 2021

Thanks for the post. I'm confused about one point though. In figure 4, why the light is fully reflected first time but not when exiting? In both cases it makes an angle of beta with the normal. Following the Snell's rule, it should be never fully reflected, if it's source is outside of the water droplet according to my understanding. It should always exit with the angle it enters.

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