69. On the grating normal to its surface

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69. On the grating normal to its surface falls monochromatic light ? = 650 nm. Behind Bars is a lens in the focal plane of which is located the screen. On the diffraction pattern is observed at an angle of diffraction ? = 300. When any main lens focal length f linear dispersion Dl = 0,5 mm / nm?

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


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