Fringe pattern of a vapour lamp

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aurao2003
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Homework Statement


Hi
Please, what fringe pattern would be obtained with a sodium vapour lamp?



Homework Equations





The Attempt at a Solution


I am guessing that a dominant yellow colour would be obtained. The sodium is almost acting like a monochromatic light and therefore has a particular wavelength. But I am not sure how correct my answer is. Also, what will the sketch look like? Please comment
 
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What is the setup?
You don't have fringes from just a lamp on it's own
 

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