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How we see color? | Physics

How we see color? Color is a property of items which man perceives his sight




The color is a property of items which man perceives his sight - seeing - when the subject is exposed to light. Colours have different wavelengths of light emitted by the source. These meters measure the old measure is angstrom. Our eye observes the wave length of 4 x IO7 m - purple - to 7 x IO * 7 m - red - as seen on display at the bottom of the page. light waves, unlike water waves or sound waves spread out in a vacuum - a vacuum - concentric motion, as which is visible in the drawing. Their fundamental feature is the frequency - the number of waves per unit time, and amplitude - height deflection.
spectrum
If prism that collects light cut short the source of white light, produced a steady beam of light of different color. solar spectrum is made of a light beam colors: red, orange, yellow, green, blue, blue - indigo - and purple. What determines the color of items?
objects absorb some colors and other refuse. We observe only the last . body that we see as red is absorbed all the colors of the spectrum except red, which was refused. If we see it as black, it means that all colors are absorbed. The body is white, has denied all the colors. Just a man and a small number of animals to see colors . These animals are primates, mammals, butterflies, bees, fish, amphibians, some reptiles and some birds. When people receive sensory color in the form of a cone, located in the retina of the eye. Some people have some or all sentient, so I can notice some or most paints.
There are three fundamental characteristics of color. first pigment, which depends on the wavelength. follows purity, which depends on a greater or lesser amount of white light mixed with paint. Splendor, which depends on a greater or lesser ability to painted surfaces that reflect light. Blue, yellow and red are primary colors, mixing them because we can get all the others. But no one basic color, we can not get by mixing other colors.
In a dark room at the same time fell three projectors with different light: green, red and blue violet. overlaying red and violet rays are produced crvenoljubičaste. Red and green make yellow, and purple and green make blue rays. Where are all three-beam overlap, resulting white light. shadow is dark surface created by the opaque body, while maintaining a light beam sources and preventing their passage. shadow is closely associated with light and can take on different colors of light from which it was created. If an object is illuminated with a beam of white light, a shadow in the background will be black. But if we use the beam of red light, we get shade of blue. In the same way, the green beam of light to give light purple shadow, a beam of purple light yellow shade. if you turn on a different colored lights at the same time, we see that there are different shades of colors and shadows obtained by combining various colors.




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