How does a reflection grating work as a diffraction source?

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Sheldon11
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How a reflection grating works as diffraction source?
 
Sheldon11 said:
How a reflection grating works as diffraction source?

by changing the angle of the incident beam of light

Slide titled Reflection Gratings with two diagrams: (a) incident light striking a mirror surface with parallel grooves, reflected as light diffracted at different angles; (b) a sawtooth ridge profile labelled Few μm.
 
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Can a steel ruler be used as a reflection grating ? if so, why?
 
Why do I get the feeling this is a homework question?
 
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