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In Young ’ s double slit experiment, the aperture screen distance is 2 m . The fringe width is 1 mm . Light of 600 nm is used. If a thin plate of glass (  = 1.5) of thickness 0.06 mm is placed over one of the slits, then there will be a lateral displacement of the fringes by

1. 0 cm
2. 5 cm
3. 10 cm
4. 15 cm

Correct answer: 5 cm

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