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

In Young's double slit experiment, a third slit is made in between the double slits. Then Correct Answer contrast between bright and dark fringes is reduced.

CONCEPT:

  • Young's Double Slit Experiment (YDSE): Monochromatic light (single wavelength) falls on two narrow slits S1 and S2 which are very close together act as two coherent sources when waves coming from two coherent sources, (S1, S2) superimposes on each other, an interference pattern is obtained on the screen.

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  • When we put n slits with a specified gap between each two.
    • In that case, you will get an interference pattern which consists of a diffraction pattern for each slit.

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  • the second one is a typical pattern for a grating where there are hundreds of slits per cm.

EXPLANATION:

  • There is a third slit, made in between the double slits, In Young's double-slit experiment.
  • Now the light is passing through three slits which was earlier passing through only two slits.
  • It results in reducing the contrast of bright fringe as well as a dark fringe.
  • So the correct answer is option 4.

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