Q. A rectangular slab (4.0 cm by 60 cm) of fused-quart glass is encased in a solid chunk of a transparent, synthetic material with the same index of refraction as diamond. A light ray strikes the middle of the 4-cm side of the slab, at an angle of 30 degrees as measured from that side of the slab to the ray. Find out the critical angle for the glass-synthetic interface (same as for the glass-diamond interface). Sketch a picture of the incoming ray as it interacts will all subsequent interfaces. Find out all angles of incidence and refraction, and label them on your diagram. If total internal reflection occurs at one of the interfaces, say so, and draw the reflected ray.