Why are wet things darker?

wet

When something gets wet, it usually appears darker. Why?
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Disappearing Light

PrismA ray of light is incident on the face AB of a prism at a small angle to the normal and emerges through the face BC. The incident angle is slowly reduced. If the ray of light strikes AB normally then no light emerges through BC at all. This is the initial position so that no light emerges through BC. The angle ABC is 400. What is the refractive index of the material of the prism?

 

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Why can’t most people see clearly underwater?

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