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Two parallel rays are travelling in a me...

Two parallel rays are travelling in a medium of refractive index `mu_(1)=4//3`. One of the rays passes through a parallel glass slab of thickness t and refractive index `mu_(2)=3//2`. The path difference between the two rays due to the glass slab will be

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`Delta x= (mu_2/mu_1-1)t=((3//2)/(4//3)-1)t=1/8`
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