1. The problem statement, all variables and given/known data
Please, what fringe pattern would be obtained with a sodium vapour lamp?
2. Relevant equations
3. 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
The full question is: Sketch an arrangement that may be used to observe the fringe pattern when light from a narrow slight slit illuminated by a sodium vapour lamp is passed through a pair of double slits.
Describe the fringe pattern you would expect to observe.
Does this help?