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JEE PHYSICS MCQ: RAY OPTICS

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A glass slab has the left half of refractive index n1n_1, and the right half of n2=3n1n_2=3 n_1. The effective refractive index of the whole slab is
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Correct option: C
3n12\frac{3 {n}_1}{2}
Option C (3n12\frac{{3 {n}_1}}{{2}}) is correct because the effective refractive index is calculated by considering the total time taken for light to travel through the slab.

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