Lockyer, Norman, Sir, 1836-1920 · London : Macmillan and Co. · leaf 247
ne case,holds a certain definite position between the red and theviolet, in another case, using a different medium, thisposition will be altered. This is what is termed by opticians the irrationality ofthe dispersions of the different media—or shortly, theirrationality of the spectrum. 458. What… … Fig. 44. — Action of two Prsms placed base to base. converge two beams coming from poir.ts at a and b toone point at c. A lens, we know, is a round piece of glass,generally thickest in the middle, and we may look uponit as composed of an infinite number of prisms. Fig. 45shows a section of such a…
Astronomy · Solar system
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