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In a standard Young's double-slit experiment with coherent light of wavelength 600 nm, the fringe width of the fringes in the central region (near the central fringe, P_(0) ) is observed it to be 3 mm. An extremely thin glass plate is introduced to be displaced by 11 mm. Another thin plate is placed before the second slit and it is observed that the fringe are now displaced by an additional 12 mm. If the additional optical path lengths introduced are Delta_(1) and Delta_(2) then

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When one of the slits of Young's experiment is covered with a transparent sheet of thickness 4.8mm , the central fringe shifts to a position originally occupied by the 30th bright fringe. What should be the thickness of the sheet if the central fringe has to shift to the position occupied by 20th bright fringe?

When one of the slits of Young's experiment is covered with a transparent sheet of thickness 4.8mm , the central fringe shifts to a position originally occupied by the 30th bright fringe. What should be the thickness of the sheet if the central fringe has to shift to the position occupied by 20th bright fringe?

In YDSE a thin film (mu=1.6) of thickness 0.01 mu m is introduced in the path of one of the two interfering beams. The central fringe moves to a position occupied by the 10th bright fring earlier. The wave length of wave is