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Asked in PMC Practice Test 35 (2021) 2021Moderate

As the wavelength of light used increases, the distance between bright fringes in the interference pattern _.

Correct answer: A. Increases

  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. None of these options are correct

Explanation

Recall the double slit equation: x = λD/a where x is the fringe separation, D is the distance between the double slit and the screen, a is the slit spacing, and λ is the wavelength of light. If λ increases, then according to the equation, x must also increase. Hence Option A is correct.

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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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