Question

-/5 POINTS KATZPSE1 36.P.045. MY NOTES ASK YOUR TEACHER Michelson's interferometer played an important role in improving our understanding of light, and it has many practical uses today. For example, it may be used to measure distances precisely. Suppose the mirror labeled 1 in the figure below is movable. -L Light source Detector If the laser light has a wavelength of 694.0 nm, how many fringes will pass across the detector if mirror 1 is moved just 1.860 mm? fringes If you can easily detect the passage of just one fringe, how accurately can you measure the displacement of the mirror? nm

Answer 1

. The path difference between the two paths of light rays coming from two mirrors is a . 2(a2-a1) = nl z in the he N = minimum number of frengs shifted (beigntos. dark) 2= wave length of light = 694 x 100m. it one of the mirror is moved by a distance = d. d= derdi = 1,860mm 20 = Na we plng the values in hand while using the relation gives. N = 2 5360 IN = 5360)

It just one flinge is passed due to the Displacement of one of the mirror numbel of fringes shifted =N=1 due to which one of the mirror is moned by a distance = d. the minimum detectable displacement of the mirror. da va = =347 om) - 347x10 9 nm
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