Laurence, Lionel · London, School of Optics · leaf 16
unequal. Measurement of Light-Speed.—Following are four methods by whichthe velocity of light has been measured. 4 GENERAL AND PRACTICAL OPTICS Rdmers Method.—One of Jupiters moons m (Fig. 2) becomes eclipsedby the planet J every 48^ hours. At a certain period of the earths annualrevolution round… … Fig. 2. from Jupiter to the earth before the eclipse can be seen. Let R and r berespectively the radii of the orbits of Jupiter and the earth round the sun.Then J E (i.e. R —r) is the distance the light has to travel at a velocity V.This time, therefore, will be (R—r)/V seconds after the eclipse…
Optics
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