In an experiment, the optical behaviour of a material was studied. The intensity of light, I, reflected from a crystal of lithium fluoride was measured as the angular position, 0, of a polariser placed between the light source and the crystal was changed. Table 6.13 gives data of the intensity (in arbitrary units) as a function of angle. Assume that the function that describes the data in Table 6.13 is of the form I= (Imax – I min) cos (20) + Imin, where Imax and Imin are constants. (i) What would you plot to obtain a straight line for the data shown in Table 6.13? Table 6.13 Variation of intensity of light reflected from a lithium fluoride crystal as a function of the angular position of a polariser 0 (degrees) Intensity (arbitrary units) 1.86 20 1.63 40 1.13 60 0.52 80 0.16 100 0.00 120 0.57 140 1.11 160 1.56 180 1.71

In an experiment, the optical behaviour of a material was studied. The intensity of light, I, reflected from a crystal of lithium fluoride was measured as the angular position, 0, of a polariser placed between the light source and the crystal was changed. Table 6.13 gives data of the intensity (in arbitrary units) as a function of angle. Assume that the function that describes the data in Table 6.13 is of the form I= (Imax – I min) cos (20) + Imin, where Imax and Imin are constants. (i) What would you plot to obtain a straight line for the data shown in Table 6.13? Table 6.13 Variation of intensity of light reflected from a lithium fluoride crystal as a function of the angular position of a polariser 0 (degrees) Intensity (arbitrary units) 1.86 20 1.63 40 1.13 60 0.52 80 0.16 100 0.00 120 0.57 140 1.11 160 1.56 180 1.71