Question: A diffraction grating has 200lines/mm light consisting of a continuous range of wavelengths between 550nm and 700 nm is incident perpendicularly on the grating. (a)

A diffraction grating has 200lines/mm light consisting of a continuous range of wavelengths between 550nm and 700 nm is incident perpendicularly on the grating.
(a) What is the lowest order that is overlapped by another order?
(b) What is the highest order for which the complete spectrum is present?

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