Question: A laser emits two wavelengths (1 = 420 nm; 2 = 630 nm). When these two wavelengths strike a grating with 450 lines/mm, they produce

A laser emits two wavelengths (λ1 = 420 nm; λ2 = 630 nm). When these two wavelengths strike a grating with 450 lines/mm, they produce maxima (of different orders) that coincide.

(a) What is the order (m) of each of the two overlapping lines?

(b) At what angle does this overlap occur?

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