Question

# What is the highest spectral order that can be seen if a grating with 6000 lines per cm is illuminated with 633-nm laser light? Assume normal incidence.

Solution

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The task is to find the highest spectral order that can be seen in a diffraction pattern of light of wavelength $\lambda=633\,\mathrm{nm}$ that passes through a diffraction grating with $N=6000\,\text{lines}/\mathrm{cm}\,.$

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