Question

Three prisms, made from materials of, refractive indices μ₁ , μ₂ and μ₃ , are arranged as shown in Fig. An incident ray, AB, emerges out as EF, following the path shown in the figure. Then the rays undergo minimum deviation in

(1) prism, μ₁ , only

(2) prism μ₁ and prism μ₂ but not in prism μ₃

(3) prism μ₃ only

(4) in all the three prims

Answer 1

(4) in all the three prims

The path of rays BC; CD and DE, inside the respective prisms, are parallel to the base of prism considered. Hence minimum deviation occurs inside all the three prisms.