What will
happen to the observed spectrum if 90% of the ruled width of the grating is covered?
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What would happen if the grating were not placed exactly at right angles to the collimated beam? Would there be any experimental advantage to doing this? Any disadvantages?
The tilted grating will behave as if it has a smaller grating space. This could indeed be useful, to get higher dispersion. Orders on one side of the zeroth order would have reduced brightness, orders on the other side would be brighter. The grating equation becomes nλ = d(sinβ - sinα) where β is the angle of the incident light and α is the angle of the diffracted beam, both measured to the grating normal.
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