Question

Define fringe width. Derive an expression for fringe width in interference pattern.?​

Answer 1

Answer:

Fringe width is the distance between two consecutive bright spots (maximas, where constructive interference take place) or two consecutive dark spots (minimas, where destructive interference take place)

The fringe formed at the centre of the fringe pattern is called the central bright fringe.

The distance between any two consecutive dark or bright fringes and all the fringes are of equal lengths. Fringe width is given by, β = D/dλ.

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