2 thoughts on “when most clothes are wet, they appear darker, but then why wet paper appear transparent???”
Explanation:
Getting a spot wet on your shirt does not make that spot permanently darker or intrinsically different. Water just makes fabric appear darker by making the fabric more transparent, allowing you to see darker objects behind the fabric.
The refractive index of fabric is a lot closer to that of water than it is to air, so the light doesn’t change speed quite as dramatically going between water and fibres. And that means it bends at a smaller angle when it goes from one to the other. It’s those small angles that are behind the darkness of the wet spot.
Explanation:
Getting a spot wet on your shirt does not make that spot permanently darker or intrinsically different. Water just makes fabric appear darker by making the fabric more transparent, allowing you to see darker objects behind the fabric.
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The refractive index of fabric is a lot closer to that of water than it is to air, so the light doesn’t change speed quite as dramatically going between water and fibres. And that means it bends at a smaller angle when it goes from one to the other. It’s those small angles that are behind the darkness of the wet spot.
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