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There is layer of medium of variable ref...

There is layer of medium of variable refractive index `mu = sqrt(2) - (1)/(sqrt(2)) y` (where `0 le t lt 1//2`) sandwitched between the layer of glass and air A beam of light travelling in air at an angle `45^(@)` has a width `Delta omega`. When the beam enters the layer of glass its width becomes : `(mu_("glass") = sqrt(2))`

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