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Vocabulary Word

Word: spectrum

Definition: colored band produced when a beam of light passes through a prism; broad and continuous range; Ex. whole spectrum of modern thoughts


Sentences Containing 'spectrum'

Whenever light passes through a prism or lens, it is dispersed or separated into all the colors which it contains, and a band of colors produced in this way is called a spectrum.
If we examine such a spectrum we find the following colors in order, each color imperceptibly fading into the next: violet, indigo, blue, green, yellow, orange, red.
If both blue and red pieces of glass are held in the path of the beam, so that the light must pass through first one and then the other, the entire spectrum disappears and no color remains.
Suppose, for example, that a white hat is held at the red end of the spectrum or in any red light.
If the red light is compound, it will be broken up into its constituent parts and will form a typical spectrum of its own, just as white light did after its passage through a prism.
But the red rays pass through the second prism, are refracted, and bent from this course, and no new colors appear, no new spectrum is formed.
Evidently a ray of spectrum red is a simple color, not a compound color.
If a similar experiment is made with the remaining spectrum rays, the result is always the same: the individual spectrum colors remain simple, pure colors.
The individual spectrum colors are groups of simple, pure colors.
The colors formed in this way do not appear to the eye different from the spectrum colors, but they are actually very different.
The spectrum colors, as we saw in the preceding Section, are pure, simple colors, while the colors formed from the rotating disk are in reality compounded of several totally different rays, although in appearance the resulting colors are pure and simple.
Moreover, by the mixture of these three colors in proper proportions, any color of the spectrum, such as yellow or indigo or orange, may be obtained.
We can show that when light passes through a prism and is refracted, forming a spectrum, as in Section 127, it is accompanied by heat.
What seems perhaps the most unexpected thing, is that the temperature, as indicated by a sensitive thermometer, continues to rise if the thermometer is moved just beyond the red light of the spectrum.
If you divide the solar spectrum roughly into half, you will have the reds, oranges, and yellows on one side, and the purples, blues, and greens on the other, the former being roughly the warm and the latter the cold colors.

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