Coherent lines emerge from two fine parallel slits 'A' and 'B' as shown in figure:If 'P' is the position of nth dark fringe from centre of interference, then phase difference between wave train 'A' and 'B' is:
Correct answer: C. (n+½) π radian
- A. nπ radian
- B. 2π n radian
- C. (n+½) π radian
- D. (2n+1) π radian
Explanation
Dark fringes are formed when we have destructive interference and since destructive interferences happen at phase differences being odd multiples of π, we have the answer as C.
This question appeared on the UHS MDCAT 2017 paper, which you can sit online with every answer explained.
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About Superposition and Interference
Superposition states that overlapping waves produce a resultant displacement equal to the algebraic sum of their individual displacements. Interference covers constructive and destructive interference, phase difference, path difference, coherent sources, and conditions for maxima and minima. It differs from diffraction, which involves spreading around openings or obstacles.
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