The book of stars; being a simple explanation of the stars and their uses to boy life, written to conform to the tests of the Boy scouts (1915)
Collins, A. Frederick (Archie Frederick), 1869- · New York, D. Appleton and company · leaf 152
Fig. 142.—Light Re-fracted. Spoon inGlass of Water. SEEING THE STARS through a prism. the prism affects the light in two ways: first,it bends the beam, and second, it separates the ether waves, orlight waves, as they are called, according to their lengths, andas color depends on the length of the… … Fig. 143.—How Light is Refracted. prism will show the different colors on a screen and this iscalled the spectrum. It is shown in Fig. 145. Lenses are pieces of glass having cnrved surfaces. Whena beam of light passes through a lens it is also bent out of itsoriginal direction, or refracted. A…
Astronomy · Stars
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