68. Normally the surface of the diffraction grating lig

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68. Normally the surface of the diffraction grating light beam falls. Placed behind bars converging lens with an optical power D = 1dptr. In the focal plane of the lens is the screen. Determine the number n of strokes per 1 mm of the grating, if the diffraction angles small linear dispersion Dl = 1 mm / nm.

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Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)


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