different known substances and com-paring it with the dispersed light of the sun we are able todetermine with certainty that sodium, calcium, copper, zinc,magnesium, hydrogen, and other substances exist there. The Rainbow. — Drops of rain decompose sunlight inthe same manner as a prism, and in this… … Fig. 74. spectrum with red on the outside; the secondary bow hasthe same colors in reverse order, the violet being on theoutside. An understanding of the formation of these bows Light. 99 may be had by a study of Fig. 74. 55, SS^ are rays ofsunlight. An observer at E will receive red light…
Physics
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