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COMEDK2024Evening ShiftPhysicsWave OpticsActual

Two narrow parallel slits illuminated by a coherent monochromatic light produces an interference pattern on a screen placed at a distance D from the slits. The separation between the dark lines of the interference pattern can be increased by

Options

  1. Adecreasing the distance between the screen and the slits
  2. Busing monochromatic light of higher frequency
  3. Cusing monochromatic light of a longer wavelength
  4. Dincreasing the distance between the slits

Correct answer

C. using monochromatic light of a longer wavelength

Step-by-step solution

The fringe width in a Young's double slit experiment is given by the formula = D d , where is the wavelength of the monochromatic light, D is the distance between the slits and the screen, and d is the separation between the two slits. The separation between the dark lines (fringe width) is directly proportional to the wavelength and the distance D , and inversely proportional to the slit separation d . To increase the fringe width , one must either increase , increase D , or decrease d . Since frequency f is relat

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