Collins, A. Frederick (Archie Frederick), 1869- · New York, London, D. Appleton and company · leaf 154
Fig. 142.—Light Re-fracted. Spoon inGlass of Water. SEEING THE STARS 133 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… … 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 curved surfaces. Whena beam of light passes through a lens it is also bent out of itsoriginal direction, or refracted. A…
Astronomy · Stars
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
