The color

Turn on a table lamp in the room, illuminated with white light. Pre-screw in it a red lamp. Put on the table a sheet of white paper. Place the lamp between him and any small object such as a pencil. On a sheet of paper will be his shadow. But its color is completely unexpected. It is not black, not gray but green...

This color is associated not only with physics, as with the physiology and psychology

This color is associated not only with physics, as with the physiology and psychology. The shadow color of the object seems to us the green due to the contrast with the background. This reddish background we perceive as white, because we know that the paper is white. Apparently, the missing red color on a plot with a shadow, our consciousness perceives as having a green color in this area. But why green?

The fact that the red or green color is additional. So called color complementary to white. And what does it mean? In the 17th century, Newton found that white sunlight is complex. It is a collection of simple colors - purple, blue, cyan, green, yellow, orange and red. This can be verified using a glass prism. If sunlight to pass through a narrow slit and directed to the prism, you get a colorful picture of this slit. Newton conducted others experiments. He "gathered" together all the colors (for example, using the lens), and as a result of the newly received white. In this case, if the "delay" any color, say green, the image of the slit becomes a color and, moreover, red. If the "delay" yellow, slit image will turn blue. It is in this sense that the colors green and red, yellow and blue are called complementary.

This interesting experiment can be carried out, if we have a different color lamp. If the light is green, the shade will turn red. If the light is blue, the color of the shadow will turn yellow. If the light is yellow, the shadow will be blue. In general, the color of the shadow always get extra to the color of the lamp.