Technician a says that the presence of oil around a fitting of an air-conditioning line may indicate an oil leak but not a refrigerant leak. technician b says that using an electronic leak detector is the best way to find the source of a refrigerant leak. who is correct

Light that is polarized along the vertical direction is incident on a sheet of polarizing material. only 96% of the intensity of the light passes through the sheet and strikes a second sheet of polarizing material. no light passes through the second sheet. what angle does the transmission axis of the second sheet make with the vertical?