Fig. 15. *20. Foucaults Method. method light from a smallsource, a narrow slit, S&g. 16,falls on a mirror JK, is reflectedto another mirror M, reflectedback to -ff, and hence back toS if JK remains fixed. Themirror R however can be madeto rotate about a vertical axis,so that by the time the… … Fig. 16. ing point &, and the distance SS can be measured. 28 LIGHT. [CH. II From this the angle turned through by the mirror, whilstthe light has been travelling from fi to M and back, can befound and hence, if the rate of rotation of the mirror be known,the time which it has taken the light…
Heat · Light
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