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In the experiment: To determine the wavelength of laser light using Lloyd's mirror. How do we...

In the experiment: To determine the wavelength of laser light using Lloyd's mirror.

How do we get two interference pattern, one top of the other but not a single interference pattern like in Young's double slit experiment? Please explain the phenomenon with the help of a diagram.

And how come here there is a dark fringe at the middle? There should have been a bright fringe like in the Young's Double Slit Experiment.

Science   Advanced-Physics   
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