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When light hits an interface of two materials of differing refractive index, refraction can take place. 8. Sketch this effect, labelling the two regions, the angle of incidence and refraction, and the two refractive indices. [4] A layer of oil floats on top of a layer of water. At the bottom is a point source of light, which emits in all directions equally. Air n = 1 Oil n = 1.3 5cm Water n = 1.5 25cm Figure 2: Point source of light underneath a layer of water and oil. 9. Calculate the critical angle for the water-oil interface. [4] 10. Calculate the critical angle for the oil-air interface. [4] 11. Using the depths of the two materials along with the two critical angles, calculate the distance labelled x in the above diagram. [8]

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