Consider a glass cube of dielectric boun...

Consider a glass cube of dielectric bound by the planes `x=0, x=a, u=0, y=b, z=0, z=c`, with `b gt a gt c`. The slab is placed in air andhas a refractive index of `n`. The minimum value of `n` such that all rays entering the dielectric at `y=0` reach `y=b` is

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