Apollo 9 launched in 1969. Its mission was to test the lunar model, the part of the space vehicle that would take the astronauts to the moon. The astronauts in the lunar module tested its engines and equipment while they orbited Earth. Which specific NASA goal did Apollo 9’s mission focus on?

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?