Question

In Y.D.S.E. if the width of the slits are gradually decreased , then (1) Bright fringe will become brighter and dark fringe become darker (2) Bright fringe become less bright and dark fringe become less dark (3) Bright fringe become brighter and dark fringe become lighter (4 Bright fringe become less bright and dark fringe become darker

Answer 1

Answer:(4)

since when you decrease the slit width the intensity of the light will decrease. Hence the bright fringe will become less bright and the dark fringe becomes darker as the intensity reduce the brightness will reduce for the whole system.