The graph in the figure above is for a diffraction grating, showing $sin$ as a function of wavelength for different orders of light. The red line corresponds to the first$-$order $(m=1)$ spectrum, and the blue line corresponds to the second$-$order $(m=2)$ spectrum.

Part $($a$)$

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Part $($a$)$

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At what angle is the third$-$order bright spot for $520$ nm light?

Part $($b$)$

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What is the grating spacing for this grating?

$i=$dotsnm