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2. 1 A student carries out a laboratory experiment to study the refraction of light. She uses two slabs of transparent material in perfect contact, slab A with refractive index n = 1.8 and slab B with refractive index n2 = 1.2. With the apparatus set up as shown in the figure below, she allows a beam of light to fall on the boundary between the two slabs at angle of incidence, i, as shown in the figure. a. B, 1221.2 20 A, n= 1.8 If the angle of incidence, i, is 30, calculate the angle to the normal, r, with which the ray emerges into the material B. Show your working. (2 marks) b. Determine the maximum angle of incidence, i, for which the ray emerges into the material B. (3 marks) C. Explain what happens if the incidence angle, i, is greater than the value determined in section(b). Support your answer with appropriate reasoning. (3 marks) speed of light in B d. What is the value of the ratio: = ? speed of light in A Show your working. (2 marks)