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physics another one

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A laser emitting light of wavelength 580 nm is incident on a diffraction grating. What is the maximum number of lines per centimeter for which the m=5 principal maximum will be visible

  • physics another one - ,

    They should have specified an angle of incidence.
    Assume the order number is m = 5 for a reflection angle of 90 degrees. Solve for the groove spacing.

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