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

Options

  1. Aintensity of finges totally disappears
  2. Bonly bright light is observed on the screen
  3. Cfringes of unequal width are formed
  4. Dcontrast between bright and dark fringes is reduced

Correct answer

D. contrast between bright and dark fringes is reduced

Step-by-step solution

When a third slit is made in between the double slits in YDSE, then contrast between bright and dark fringes is reduced. 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.

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