You are given a diffraction grating and you shine laser light with wavelength 645 nm through it and produce a diffraction pattern on a screen. You measure the 3rd order bright spot to be at angle 66.5° above the horizontal distance (from the grating to the screen). Using the same grating, calculate the angle (in degrees) pointing to the 2nd order bright spot if you used a laser with wavelength 400 nm.

You are given a diffraction grating and you shine laser light with wavelength 645 nm through it and produce a diffraction pattern on a screen. You measure the 3rd order bright spot to be at angle 66.5° above the horizontal distance (from the grating to the screen). Using the same grating, calculate the angle (in degrees) pointing to the 2nd order bright spot if you used a laser with wavelength 400 nm.