For bright fringe formation, the path difference is:
Correct answer: B. nλ where n = 0, 1, 2, .............
- A. (n +½) λ where n = 0, 1, 2, .............
- B. nλ where n = 0, 1, 2, .............
- C. (2n + 1) λ/2 where n = 0, 1, 2, .............
- D. ((n +1)/2) λ2 where n = 0, 1, 2, ............
Explanation
For maximum intensity or bright fringe to be formed at P Path difference, Δz = nλ (n = 0, ±1, ±2, . . . .)
This question appeared on the UHS MDCAT 2016 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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