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a compensating plate is used in michelson interferometer to compensate the additional path difference of ray 1

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Q: What is the purpose of compensating plate in michelson interferometer?
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Why you use semi silvered plate in michelson interferometer?

To get a double image, which is then focused until one gets coincidence. Sextants, some camera rangefinders, etc make use of this beam-splitting principle.


Why compensating plate is used in michelson interferometer?

I have never seen one of these instruments but it stands to reason the compensating plate is used to adjust the instrument to local operating conditions. It is not too different, in practice, from the idea of an aiming-off device on some cameras( called also a perspective correction device) turning a knob on an index ( very similar to the regulator quadrant on a fine watch_ will move the lens assembly left or right on the scale, affecting the composition and possibly eliminating unwanted stuff- for example one wants a picture of a statue ( I can think of the Old placement of the Columbus statue at Journal Square without getting the Flagpole behind it in the picture. could come in handy. corrective adjustments are vital to scientific instruments which may be used in widely differing latitudes, magnetic fields etc. It is like the declination adjustment on a compass.


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