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 a n d n 2

Question

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 a n d n 2 > n 1 , as shown in the figure. A ray of light is incident with angle θ i from medium 1 and emerges in medium 2 with refraction angle θ f with a lateral displacement l . Which of

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Correct answer: A. l is independent of n 2

For parallel slab n 1 sin ⁡ θ i = n 2 sin ⁡ θ f And l depends on refractive angle in slab ∴ l depends on refractive index of slab and independent of n 2

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