A plane parallel glass slab (n=1.52) is kept over a tank of water (n=1.33). A ray of light in air is incident on the upper surface of the glass at an angle of 30∘ to the normal and finally emerges into the water.
(i) Calculate the angle that the ray makes with the normal inside the glass.
(ii) Determine the angle the emergent ray makes with the normal in water.
(iii) Find the net angular deviation of the emergent ray from the direction of the original incident ray.