A glass slab has the left half of refractive index n1, and the right half of n2=3n1 . The effective refractive index of the whole slab is

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n12

2n1

3n12

2n13

answer is C.

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Detailed Solution

Applying apparent depth formuladneff=d2n1+d2n2⇒neff=2n1n2n1+n2=32n1

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