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A transparent slab of thickness \( d \) has a refractive index \( n(z) \) that increases with distance inside the slab, measured from the top. The slab is placed between tr
\( \mathrm{P} \) refractive indices \( n_{1} \) and \( n_{2}\left(n_{1}\right) \), as shown in the figure. A ray of light is inci medium 1 and emerges in medium 2 with refraction angle \( \theta_{f} \) with a lateral displ:
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Which of the following statement(s) is(are) true ?
(A) \( n_{1} \sin \theta_{i}=\left(n_{2}-n_{1}\right) \sin \theta_{f} \)
(B) \( l \) is independent of \( n_{2} \)
(C) \( n_{1} \sin \theta_{\mathrm{i}}=n_{2} \sin \theta_{\mathrm{f}} \)
(D) \( l \) is dependent on \( n(z) \)
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