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While conducting the Young's double slit experiment, a student replaced the two slits with a large opaque plate in the x-y plane containing two small holes that act as two coherent point sources (S 1 , S 2 ) emitting light of wavelength 600 nm. The student mistakenly placed the screen parallel to the x-z plane (for z > 0) at a distance D = 3 m from the mid-point of S 1 S 2 , as shown schematically in the figure. The distance between the sources d = 0.6003 mm. The origin O is at the intersection of the screen and the line joining S 1 S 2 . Which of the following is(are) true of the intensity pattern on the screen ? S 1 S 2 x z O y D d Screen

1. Semi circular bright and dark bands centered at point O
2. The region very close to the point O will be dark
3. Straight bright and dark bands parallel to the x-axis
4. Hyperbolic bright and dark bands with foci symmetrically placed about O in the x-direction

Correct answer: Semi circular bright and dark bands centered at point O

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