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Statement of a problem № 11323

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Light of wavelength 410 nm (in vacuum) is incident on a diffraction grating that has a slit separation of 1.2 x 10-5 m. The distance between the grating and the viewing screen is 0.15 m. A diffraction pattern is produced on the screen that consists of a central bright fringe and higher-order bright fringes (see the drawing). (a) Determine the distance y from the central bright fringe to the second-order bright fringe. (b) If the entire apparatus is submerged in water (nwater = 1.33), what is the distance y?




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