A vessel ABCD of 10 cm width has two small slits S_(1) and S_(2) sealed with identical glass plates of equal thickness. The distance between the slits is 0.8mm. POQ is the line perpendicular to the plane AB and passing through O, the middle point of S_(1). A monochromatic light source is kept at S, 40 cm below P and 2m from the vessel to illuminate the slits as shown in fig. The position of the central bright fringe on the other wall CD w.r.t. the line OQ.

A vessel ABCD of 10 cm width has two small slits S_(1) and S_(2) seale

1.	A vessel ABCD of 10 cm width has two small slits S_(1) and S_(2) sealed with identical glass plates of equal thickness. The distance between the slits is 0.8mm. POQ is the line perpendicular to the plane AB and passing through O, the middle point of S_(1). A monochromatic light source is kept at S, 40 cm below P and 2m from the vessel to illuminate the slits as shown in fig. The position of the central bright fringe on the other wall CD w.r.t. the line OQ.
Answer» 4 cm 6 cm 5 cm 2 cm Answer :D

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