In Young's double slit arrangement, water is filled in the space between screen and slits. Then:

Options

• Option A

  fringe pattern shifts upwards, but fringe width remains unchanged.

• Option B

  fringe width decreases, and central bright fringe shifts upwards.

• Option C

  fringe width increases, and central bright fringe does not shift.

• Option D

  fringe width decreases, and central bright fringe does not shift.