In an interference pattern______________________?
Correct answer: C. both dark and bright fringes are of equal width
- A. bright fringes are wider than dark fringes
- B. dark fringes are wider than bright fringe
- C. both dark and bright fringes are of equal width
- D. central fringes are brighter than the outer fringes
Explanation
For equally spaced interference fringes, the positions of successive bright and dark fringes are equally separated, so their widths are equal. Option d may attract students who confuse interference with single-slit diffraction, where the central maximum is wider and brighter than the side maxima.
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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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