Question:
Let us list some of the factors, which could possibly influence the
speed of wave propagation:
(i) nature of the source.
(ii) the direction of propagation.
(iii) the motion of the source and/or observer.
(iv) wavelength.
(v) the intensity of the wave. On which of these factors, if any, does (a) the speed of light in a vacuum,
(b) the speed of light in a medium (say, glass or water), depend?
Solution:
(a) The speed of light in the vacuum does not depend on any of the factors listed.
(b) The speed of light in the medium depends on the wavelength of the light in that medium