A Laser Beam with Wavelength 10 $\mu$ M Is Split into Two Beams by a Beam Splitter

A laser beam with wavelength 10.6 $\mu$ m is split into two beams by a beam splitter in a Michelson interferometer.One beam goes to Mirror 1,a distance L from the beam splitter,and returns to the beam splitter while the other beam goes to Mirror 2,a distance L + $\Delta$ x from the beam splitter,and returns to the same beam splitter.The beams then recombine and go to a detector together.If L = 1.00000 m and $\Delta$ x = 1.20000 mm,which best describes the kind of interference at the detector?

A) purely constructive
B) purely destructive
C) mostly constructive
D) mostly destructive
E) neither constructive nor destructive

Correct Answer:

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