Chapter 35, Problem 35.11OQ

A light ray navels from vacuum into a slab of material with index of refraction n₁ at incident angle θ with respect to the surface. It subsequently passes into a second slab of material with index of refraction n₂ before passing back into vacuum again. The surfaces of the different materials are all parallel to one another. As the light exits the second slab, what can be said of the final angle ϕ that the outgoing light makes with the normal? (a) ϕ  > θ (b) ϕ < θ (c) ϕ = θ (d) The angle depends on the magnitudes of n₁ and n₂. (e) The angle depends on the wavelength of the light.