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Why the velocity of light in vacuum is independent of wave length ?
Speed of any wave does not depend on the wavelength. It depends only on the elastic and inertia properties of the medium.
In vaccum if frequency increases wavelenth decreases, if wavelenth increases frequency decreases so velacity in vaccum is independent of wavelenth
na= refractive index of air = 1
nb=refractive index of vacume = 0
va=velocity of light in air =3*10^8m/s
vb=velocity of light in vacume
we know that na/nb= vb/va
then vb = 3*10^8m/s
fa = va/lmdab ; fb = vb/lmdab
by this fa=fb&va=vb
then lmda a=lmada b
so that the velocity of light in vacuum is independent of wave length
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