Question

5. You illuminate a Michelson interferometer with a helium-neon laser. The interference pattern is uniform - there are no stripes or rings. The laser has a wavelength of 632.8 nm. You move the mirror on the translation stage until the intensity of the interferometer output is maximum. You measure that the output intensity is 10 = 0.80 mW/cm . Then, you move the mirror on the translation stage by some additional amount Ar. You observe that the output intensity drops monotonically to 0.63 mW/cm². What was the value of Ar? (Note the specification that the intensity falls monotonically means that the intensity never went to zero during your additional mirror displacement.)

Answer 1

so elut celice - prisery IL EFES leten, at ako, I 11- tos Cake de-as)) los (ak(e-dz - given data Intensity to - Imaa s to 0.80 mwlen" A2632.80m [i-cos(akons] manimum values Ireaches cos (Kex) = -1 to (1-1] is Iman ã = to 0.80 Iman = I= 0.6mwlem ») 063 - 0.80 Ci- cos Colcow) 1,575 IsCalla) -0.545 Ecos (4T104) 1. coi'casas) -1834 x 632-8 nm 4tton : 2.1834 : 2.1834 4. La on : 109.950 m