Elementary astronomy; a beginner's text-book (1899)
Holden, Edward Singleton, 1846-1914 · New York, H. Holt and company · leaf 463
Itis the order of the colors in the rainbow.) If parallel raysof white light, as sunlight, r r, fall on a prism, the red rays 433 434 APPENDIX. of this beam will still fall at r r\ and the violet rays willfall at v v. Between v and r the other rays will fall, inthe order just given; that is, in the… … Fig. 220.—The Action op a Prism on a Beam of White Light. star. The solar spectrum is very bright; the lunar spec-trum is much fainter; and the spectrum of a star is farfainter than either. If we let parallel rays, r r, of red light come through a circularhole at Q (Fig. 220), they will form a…
Astronomy
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