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# In physics, interferometry is a family of techniques in which waves, usually electromagnetic waves, are superimposed causing the phenomenon of interference in order to extract information about the waves. Interferometry is used in radio astronomy, microscopy, infrared imaging, sonar and radar.

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##### Marshall S.

University of Washington

##### Farnaz M.

Simon Fraser University

##### Jared E.

University of Winnipeg

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### Video Transcript

welcome to our second example video. Looking at the Michaelson Interferometer in this video, we're going to consider a source of light equal to 630 nanometers, which is in the visible spectrum. So we can see it and we move mere too by a distance of one centimeter. How maney fringes are we going to see go by? So setting up our equation again, we have X equals Delta M times Lambda, divided by two Delta M will be equal to two times X over Lambda in this case, then we have two times one centimeter, which is two times 10 times 10 to the negative, too meters, all divided by Lambda, which is 630 times 10 to the negative 9 m. We have something on the order of 10 to the negative two divided by something on the order of 10 to the negative seven. This means that we're going to have on the order of 10 to the five fringes, go by. Okay, so this is an enormous amount of fringes. Takes a lot of concentration to run this experiment. But again, if you could get a computer to monitor it for you, then you can do it pretty quickly.

RC
University of North Carolina at Chapel Hill
##### Marshall S.

University of Washington

##### Farnaz M.

Simon Fraser University

##### Jared E.

University of Winnipeg