Experiment Setup: (How to experimentally determine the diffraction bright fringe angle). In your textbook problem, you were able to solve for the unknown laser wavelength because you were given the original diffraction grating spacing and the diffraction m=1 bright fringe angle. However, in lab, you will not be given the diffraction m=1 bright fringe angle because you are setting up the laser and the diffraction grating to measure the m=1 bright fringe angle. How will you measure this angle, because you will not have a protractor? Instead of directly measuring an angle, you will have to measure the lengths associated with the triangle that creates the angle, and to use trigonometry to calculate the angle from your length measurements. Going back to the setup outlined in Figure 1, describe what lengths you will measure in your experimental setup and how you will obtain the angle from those lengths.