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Question: Answered & Verified by Expert

In a YDSE, if the slits are of unequal widths,

PhysicsWave OpticsNEET
Options:
  • A fringes will not be formed
  • B the positions of minimum intensity will not be completely dark
  • C bright fringe will not be formed at the centre of the screen
  • D distance between two consecutive bright fringes will not be equal to the distance between two consecutive dark fringes.
Solution:
1286 Upvotes Verified Answer
The correct answer is: the positions of minimum intensity will not be completely dark
If width of the slits are different, the ray undergoing interference will be of different intensity. So, when they will be out of phase, they will not completely cancel each other, resulting in minimum non zero intensity.

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