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Fringe Width in YDSE

Why are the f...

Question

Why are the fringes straight and parallel?

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Solution

In a wedge-shaped film, each fringe is the locus of points of equal thickness in the film.
The fringes are straight because their shape depends on how the thickness of the air film enclosed varies.
It is parallel to the edge of the wedge.
Thus, this is the reason for fringes that why look straight and parallel.

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