A grating has 1000 lines/mm of width. How wide must the grating be in order to resolve the mode structure of a HeNe laser beam of wavelength 633 nm? The frequency difference between the modes is 450 MHz.
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Q: A grating has 1000 lines/mm of width. How wide must the grating be in order to resolve the mode…
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I need help woth this pleaz, thanks
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