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A transparent slab of thickness d has a ...

A transparent slab of thickness d has a refractive index n(z) that increases with z. Here z is the vertical distance inside the slab, measured from the top. The slab is placed between two media with uniform refractive indices `n_(1)` and `n_(2)(gtn_(1))`, `theta_(i)`, from medium 1 and emerges in medium 2 with refraction angle `theta_(f)`with a lateral displacement l.
Which of the following statement(s) is (are) true?

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