Other
Scientific paper
Oct 1881
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1881natur..24..556m&link_type=abstract
Nature, Volume 24, Issue 624, pp. 556 (1881).
Other
1
Scientific paper
WITH reference to Lord Rayleigh's article on the Velocity of Light (vol. xxiv. p. 382) I, and possibly others, find it difficult to follow him when he says, in the case of all the methods for determination of the velocity of light except the aberration method, that the velocity arrived at is the ``group velocity'', and not necessarily the ``wave velocity''. I, for one, should be glad of further exposition. Does not Foucault's revolving mirror experiment, for instance, measure the velocity of motion of the centre of the disturbance which is transmitted from mirror to mirror? And would it not be the case that, if the waves moved faster than the groups, new groups would be continually formed ahead, the old ones dropping out behind: so that the centre of the disturbance would not remain in any given group? Further, is any credence to be given to the result that blue light travels anything like 1.8 faster than red light, while this is unconfirmed by the colours of Jupiter's satellites?
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