Diffraction grating & young double slit -light not perpendicular to grating

AI Thread Summary
When light is not perpendicular to a diffraction grating or double slit, it can lead to incoherent light arriving at the slits, affecting the interference pattern. The interference fringes may shift, altering the positions of reinforcement lines, but the fringe separation remains unchanged for a double slit setup. The path difference between rays passing through adjacent slits is crucial for understanding this effect. A diagram can help visualize these changes. The overall impact is primarily a shift in the interference pattern rather than a change in fringe spacing.
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Homework Statement



I was a asked a question from an experiment: What happens if the light shone into the diffraction grating or a double slit is not perpendicular to the diffraction grating or double slit? What will happen?

The Attempt at a Solution



Straight away i can tell that the light might not arrive coherently to the slits because of this. But i don't know how incoherent light coming out of the slits will effect anything. All i can imagine happening is that the interference pattern will just shift, so lines of reinforcement will not appear where they were before, but the fringe separation (for double slit) will not be effected at all? Am i right? Or wrong?
 
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Find the path difference between the rays going through two neighbouring slits. I drawing would be beneficial. ehild
 

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