Question

If one of the two slits of Young's double-slit experiment is painted so that it transmits half the light intensity as the second slit, then

• A. fringe system will altogether disappear
• B. bright fringes will become brighter and the dark fringes will become darker
• C. both dark and bright fringes will become darker
• D. dark fringes will become less dark and bright fringes will become less bright.

Answer 1

The correct option is D dark fringes will become less dark and bright fringes will become less bright.

as the intensity from second slit decreases the bright fringe becomes darker due to constructive interference and dark fringe becomes bright due to destructive interference
option $D$ is correct