A Michelson interferometer uses light from a sodium lamp. Sodium atoms emit light having wavelengths 589.0 nm and 589.6 nm. The interferometer is intially set up with both arms of equal length (L1=L2) producing a bright spot at the center of the interference pattern. How far must mirror M2 be moved so that one wavelength has produced one more new maxima than the other wavelength?
wavelength = 2 (delta L) / (delta m)
The Attempt at a Solution
I know that we are looking for delta L but I don't know which wavelength and m value to use.
please somebody guide me.