Physics-

General

Easy

Question

# In the set up shown in Fig the two slits, and are not equidistant from the slit S. The central fringe at O is then

- Always bright
- Always dark
- Either dark or bright depending on the position of S
- Neither dark nor bright.

## The correct answer is: Either dark or bright depending on the position of S

### If path difference D = (SS_{1} + S_{1}O) – (SS_{2} + S_{2}O) = nl n = 0, 1, 2, 3, .... the central fringe at O is a bright fringe and if the path difference l, n = 1, 2, 3, ..... the central bright fringe will be a dark fringe

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