65. On the diffraction grating with a period of 2 micro

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65. On the diffraction grating with a period of 2 microns is normally incident beam of light from the discharge tube filled with helium. What is the difference of wavelengths can allow the grating in the red light (λ1 = 0,7 mm) in the spectrum of the second order, if the lattice width of 2.5 cm? At what wavelength in the spectrum of the second order is superimposed blue line (λ2 = 0,447 m) third-order spectrum?

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


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