Light from a laser strikes a diffraction grating that has 4250 grooves per centimeter. The central and second order principal maxima are separated by 0.850m on a wall 1.50m from the grating.
a. Find the wavelength of the laser.
b. In separate experiment, microwaves of wavelength 5.00cm pass through a tall, narrow slith of width 36.0cm. If the microwaves are projected to a wall 6.50m from the slit, find the central maximum width of the microwaves diffraction pattern.