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A ray of light enters a glass slab from ...

A ray of light enters a glass slab from air as shown in figure. If refractive index of glass slab is given by `mu=A-Bt`, where A and B are constants and t is the thickness of slab measured from the top surface. Find the maximum depth travelled by ray in the slab. Assume thickness of slab to be sufficiently large.

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`1/B (A-(sqrt(3))/(2))`
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AAKASH SERIES-RAY OPTICS-PROBLEMS ( LEVEL-II)
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