Need help completing this polarimetry lab assignment , please

Data Table 4: Resistance and Light Intensity for Three Crossed Polarizers Angle (degrees) Resistance R Relative Light Adjusted Light (kilo Ohms) Intensity 1/R (a.u.) Intensity 1/R - 1/ R. (a.u.) 0 10 20 30 40 50 60 70 90 100 110 120 130 140 150 160 170 180 17/18 Graph 2: Three Crossed Polarizers Insert your graph here. Write a complete lab report and submit in via Canvas course page and answer following questions in "Discussion" section. 1) Why was this exercise performed in a dimly-lit room? What was the purpose of measuring the background intensity? 2) Why would an LCD display on calculators or electronic wristwatches appear completely black when viewed through polarized sunglasses? How could one read the display without removing the sunglasses