Question #38523

1 Answer
A08
May 24, 2017

699nm

Explanation:

As light travels to and from the mirror, for a distance of lambda/2 to the mirror, one full wavelength lambda shift at the detector will be noted. We know that for 1 wavelength movement there is constructive interference. Hence, one fringe will move into a position previously occupied by the original fringe.

Fringes moved =644
Mirror moved =0.225mm
"Number of fringes"xxlambda/2="Distance moved by movable mirror"
=>lambda=0.225xx2xx1/644=6.99xx10^-7m

=699nm

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