![]() ![]() (e) Calculate the minimum possible thickness of the oil film. ![]() _The air-oil interface only _The oil-water interface only _Both interfaces _Neither interface ![]() (d) At which of the two interfaces does the light undergo a 180º phase change on reflection? ![]() The student measures a maximum in the intensity of the reflected light when the incident light has a wavelength of 600 nm. Light from a variable wavelength source is incident vertically onto the oil film as shown above. 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). (c) Using the graph, calculate the index of refraction of the glass slab. (b) On the grid, plot the quantities calculated in (a) and draw an appropriate graph from which the index of refraction can be determined. (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. The measurements of the angles for five trials are given in the table below. She is asked to use a laser beam to measure angles of incidence θ i in air and corresponding angles of refraction θ r in glass. The drawing board should be soft so that pins can be easily fixed on it. A student performs an experiment to determine the index of refraction n of a rectangular glass slab in air. The rectangular glass slab used should have perfectly smooth faces. ![]()
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