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Publisher: Kessinger Publishing, LLC
Humphrey, Samuel D.
The decomposition of a beam of light can be noticed by exposing it to a prism. If, in a dark room, a beam of light be admitted through a small hole in a shutter, it will form a white round spot upon the place where it falls. If a triangular prism of glass be placed on the inside of the dark room, so that the beam of light falls upon it, it no longer has the same direction, nor does it form a round spot, but an oblong painted image of seven colors--red, orange, yellow, green, blue, indigo, and violet. This is called the solar spectrum.Humphrey, Samuel D. is the author of 'American Handbook Of The Daguerreotype' with ISBN 9781419105791 and ISBN 1419105795.
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