Physics

Monochromatic light


According to its color, light can be classified as monochrome or polychromatic.

It's called monochrome light one composed of only one color, such as yellow light emitted by sodium lamps.

It's called color light one composed of a combination of two or more monochrome colors, such as white light from the sun or ordinary light bulbs.

Using a prism, it is possible to decompose the polychromatic light into the monochromatic lights that form it, which is not possible for monochromatic colors such as red, orange, yellow, green, blue, indigo and violet.

An example of the composition of the monochromatic colors that make up white light is Newton's disc, which is an experiment composed of a disc with the seven colors of the visible spectrum, which when rotating at high speed "recomposes" the monochromatic colors, forming the white polychromatic color.

Color of a body

All around us it is possible to distinguish various colors, even when we are under the bright sunlight.

This phenomenon happens because when white light is shone on a green body, for example, it absorbs all other colors in the visible spectrum, diffused only green, which makes it possible to distinguish its color.

Therefore, a white body is one that reflects all colors without absorbing any, while a black body absorbs all colors on it without reflecting any, which causes warming.