In Young's double slit experiment, a glass plate is placed before a slit which absorbs half the intensity of light. Under this case

Options :
  1. the brightness of fringes decreases
  2. the fringe width decreases
  3. no fringes will be observed
  4. the bright fringes become fainter and the dark fringes have finite light intensity
Answer and Explanation :-

Answer: Option 4


By the introduction of a thin plate, the entire fringe pattern is shifted.

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