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J. Perelman
"Entertaining physics". Book 1.
Chapter 9. Vision one and two eyes


On now considered the principle is based and the effect of those “wonders of shadows”, which appeared sometimes in the movies.

Here it is appropriate to talk about a series of experiments, very like the visitors ' Pavilion entertaining science” in Leningrad tspko on Kirov Islands. One room is furnished as a living room. You see furniture in dark orange covers; table covered with green cloth; it is a carafe of cranberry juice and flowers; a shelf filled with books with colored labels on the spines. First of all it shows under normal white light. Then turn the switch - white light is replaced by red. This raises the living room unexpected change: furniture becomes pink, green cloth turns into a deep purple; the juice is colorless, like water, the flowers change color and appear to be completely different; part label on the book spines disappears...

When the new turn switch area is filled with green light and the look of your living room again unrecognizably changed.

All these interesting metamorphoses well illustrated by the Newtonian doctrine of painting phone the essence of the teachings that the surface of the body has always color not those rays, which it absorbs, and those it scatters, i.e., discards in the eye of the observer. Famous compatriot Newton, English physicist Tyndall, articulates this position:

“When we light the subject with white light, the red color is formed by the absorption of green light and green - red absorption, whereas the other colours in both cases occur. It means that the body acquires its color negative way: the color is a consequence, not additions, and exceptions.

Green cloth, therefore, because the green color when white light that it is able to dissipate the primarily rays of green and adjacent spectrum; other rays it dissipates negligible amount, a greater part of them absorbs. If you put on a tablecloth mixture of red violet rays, the tablecloth will dissipate almost alone purple, absorbing most of the red. Eyes will get the impression of a dark purple color.

Estimated that reason and all other color metamorphosis in the corner of the living room. Mysterious is the discoloration Morse: why red liquid at a red light seems to be colorless? The clue is in the fact that the carafe of juice standing on the white cloth spread on the green tablecloth. If you remove the carafe with napkins, and you will discover that the red rays of the liquid in the decanter is not colorless, and red. Colorless seems she only next to the cloth, in which a red light is red, but we by habit, and by contrast with the dark color tablecloth still be considered white. As well as the color of the liquid in the decanter with the same color putatively white napkins, we inadvertently attributed and the Morse white color; it becomes in our eyes no longer a Morse, and colorless water.

Experiments similar to those described, can be done in a simplified situation: enough procuring colored glass to look through around the subject.

Entertaining physics J. Perelman


System Orphus


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