Q127 / 180 · COMEDK 2018 · Physics

In Young's double slit experiment, a third slit is made in between the double slits. Then,

  • A
    intensity of finges totally disappears
  • B
    only bright light is observed on the screen
  • C
    fringes of unequal width are formed
  • Correct answer
    D
    contrast between bright and dark fringes is reduced

Solution

When a third slit is made in between the double slits in YDSE, then contrast between bright and dark fringes is reduced. $\hat{t}$ is because in the case of double slits, light passes only two slits. Now, the same light is passing through the three slits which results in reducing the contrast of bright fringes as well as dark fringes.

Hence, the correct answer is option: 'D'.

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