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What is it about the chemical composition of water that turns certain objects such as hair or sand or clothes a shade darker?
Wiki User
∙ 11y ago
It is nothing to do with the chemical composition of water. It is to do with a property of light. When light arrives at an interface between two transparent substances with different refractive indices, some of the light passes onwards, and some is reflected back.
When you look at somebody's hair, light from the sun or the sky or a lamp reflects off the hair, and comes back to your eye. How much of the reflected light comes back to your eye determines lighter or darker -- more reflected light for lighter, less reflected light for darker.
If you look at somebody's hair under the water, the light from sun sky or lamp first hits the water surface. The part that goes ahead and reaches the hair then reflects back off it, but some of the light has been lost when the light hit the surface of the water. The light that has reflected off the hair then reaches the surface of the water again. And again part of that light is lost by reflection. The amount of light that comes back to you from the hair is only a fraction of the light that was reflected from the hair, and the light that reached the hair to be reflected was only a fraction of the light originally available from sun sky or lamp.
The result? Less light from the hair when other things in the room that are not under the water are still sending back the same light for comparison means that the hair will look darker.
Wiki User
∙ 11y ago
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