Abstract
When sunlight is passed through a glass prism, the effect which is known as the spectrum is produced. The light rays that are seen in the spectrum as various colors differ from one another in their wavelengths. The red rays have a wavelength of 600 millimicrons, while the violet rays at the other end of the spectrum have a wavelength of 400 millimicrons. (One millimicron is equal to 1/1,000,000 of a millimeter.) In radiant energy from the sun there are also longer rays than the red, which are known as infra-red or heat rays. Similarly, there are rays shorter than those of visible light, which are known as ultraviolet rays. They have a wavelength ranging from 380 to 290 millimicrons. Rays of shorter wavelength do not reach the surface of the earth from the sun, owing to the absorption by the atmosphere. The value of ultraviolet rays in the prevention
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