White light strikes a diffraction grating (540 lines/mm) at normal incidence. What is the longest wavelength that forms a third-order maximum?© BrainMass Inc. brainmass.com March 4, 2021, 6:20 pm ad1c9bdddf
We have grating law:
(a + b) Sin (theta) = n * lambda
where a + b = grating element
theta = angle of diffraction with maximum value ...
This solution uses grating law and shows complete calculations and answer.