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23 Nov 2019

*Chapter 27, Problem 50 GO

Light of wavelength 410 nm (in vacuum) is incident onadiffraction grating that has a slit separation of 1.2x10-5 m. The distance between the grating and theviewingscreen is 0.19 m. A diffraction pattern is produced on thescreenthat consists of a central bright fringe and higher-orderbrightfringes (see the drawing). (a) Determine the distance y fromthecentral bright fringe to the second-order bright fringe. (Hint:Thediffraction angles are small enough that the approximationtan(θ)~ sin(θ) can be used.)(b) If the entire apparatusis submerged inwater (nwater = 1.33), what is thedistance y?

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