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The wavelength of light in vaccum is lam...

The wavelength of light in vaccum is `lamda_0`. When it travels normally through glass of thickness t. Then find the number of waves of light in t thickness of glass (refractive index of glass is `mu`).

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Number of waves is a thickness t of a medium of refractive index `mu` is
number of waves `=(thickn ess)/(wavel en g th) =t/lamda_m`
But `lamda_m=lamda_0/mu`, `therefore` number of waves `(t mu)/lamda_0`
Where `lamda_0` is the wavelength of light in vaccum.
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