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# In Young’s experiment, monochromatic light is used to illuminate the two slits *A* and *B*. Interference fringes are observed on a screen placed in front of the slits. Now if a thin glass plate is placed normally in the path of the beam coming from the slit

- The fringes will disappear
- The fringe width will increase
- The fringe width will increase
- There will be no change in the fringe width but the pattern shifts

## The correct answer is: There will be no change in the fringe width but the pattern shifts

### In the presence of thin glass plate, the fringe pattern shifts, but no change in fringe width.

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