Polar Bear - Terrible inhabitant of the Northern Hemisphere of the Earth. He loves eating seals and nerve, lives on drifting floes and is the hero of many cartoons. It would seem that even the name of the becher indicates what color he has - of course, whites. And do you believe that the white bear does not be white at all, but transparent?
As is known, the color of the substance is determined by the part of the visible electromagnetic waves, this substance can reflect. For example, the blue paint does not pass electromagnetic waves, the length of which corresponds to blue color. These waves are reflected and fall on the retina of our eye, which, being a kind of electromagnetic radiation receiver, reads their blue color. For the item to be black, it should absorb all the light waves aimed at it, and so that white - on the contrary, reflect. If the subject is transparent, then light waves simply pass through it.
Just with a transparent hollow tube filled with air, and is every wool of a polar bear. Nature presented this amazing tool to bear this amazing tool. It turns out if the fur is transparent, the light should pass through it and reach the skin, which has white bears in black. But why then, no matter how strange the question sounded, the white bear is not black? Each wool on the skull of the North Pole host, though transparent, but not perfectly smooth. Wood on small tubercles on a fur, rays of light refracted, falling onto other wool, where they are refracted again, and so on. Speaking by scientific language, the direction of the propagation of electromagnetic waves of the visible range occurs. This process is called scattering of light.
Finally, the light, almost without penetrating through the wool, is reflected back towards the observer, which perceives the white fur. Why white? Because the light that goes to us from the sun is a combination of light waves of different lengths, which in the aggregate give white color (more "What color is the sun actually?").
So, isn't it time to call a white bear "transparent"?
This is interesting: The same rule is valid for Snow that seems white to us, although each separate snowflake is transparent.