JEE Advanced 2021 Paper 2

For a prism of prism angle θ=60∘, the refractive indices of the left half and the right half are, respectively, n1 and n2 ( n2≥n1 ) as shown in the figure. The angle of incidence i is chosen such that the incident light rays will have minimum deviation if n1=n2=n=1.5. For the case of unequal refractive indices n1=n and n2=n+∆n (where ∆n≪n ), the angle of emergence e=i+∆e. Which of the following statement(s) is (are) correct?