Please copy the table below on your paper. A student performs an experiment to verify Snell's Law and determine the index of refraction n of a rectangular glass slab in air. She asked to use a laser beam to measure angles of incidence 0; air and corresponding angles of refraction Or in glass. The measurements of the angles for five trials are given in the table below. Trial Or 30 200 2 40 270 50 320 4 60 370 5 70 40 (a) Complete the last two columns in the table by calculating the quantities that need to be graphed to provide a linear relationship from which the index of refraction can be determined. Label the top of each column. (b) On the grid shown in the next page, plot the quantities calculated in (a) and draw an appropriate graph from which index of refraction can be determined. Label the axes.C. Using the graph, calculate the index of refraction of the glass slab. D. The student now uses a semi circular glass block of the same refractive index as in part C. Using the same laser beam calculate the critical angel Oc for which total internal reflection can take place inside the glass slab.Light Source Air Oil film Water The student is also asked to determine the thickness of a film of oil (n = 1.43) on the surface of water (n = 1.33). Light from a variable wavelength source is incident vertically onto the oil film as shown above. The student measures a maximum in the intensity of the reflected light when the incident light has a wavelength of 600 nm. E. At which of the interfaces does the light undergo a it phase change on reflection? The air-oil interface only The oil-water interface only Both interfaces Neither interface F. Calculate the minimum possible thickness of the oil film