Solve the following question given below:
Question: In a laboratory, light from a particular spectrum line of helium passes through a diffraction grating and the second-order maximum is at 18.9 degrees from the center of the central bright fringe. The same grating is then used for light from a distant galaxy that is moving away from the earth with a speed of 2.65e7 m/s. For the light from the galaxy,
Part A- What is the angular location of the second-order maximum for the same spectral line as was observed in the lab?
Your answer must be supported by illustrations, thank you.