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 [UPSEAT 1993, 2000; AIIMS 1999, 2004]

• A. The fringes will disappear
• B. The fringe width will increase
• C. The fringe width will increase
• D. There will be no change in the fringe width but the pattern shifts