Diffraction grating and wavelength

AI Thread Summary
The discussion focuses on understanding the use of sin90 in the equation nλ=dsinθ for diffraction gratings. It clarifies that sin90 is used because it represents the maximum angle for observable diffraction, ensuring optimal sine value. The conversation also addresses the relationship between higher order beams and the zero order, confirming that the zero order is always at 0 degrees. This establishes a clear reference point for determining the angles of other order beams. Understanding these principles is essential for analyzing diffraction patterns effectively.
CAH
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Hi I've attached the question and mark scheme,

I don't understand part 6(d)... Why have they used sin90?

nλ=dsinθ

If there is another order beam how can it be known the angel at which it exists from the zero order?
Thanks
 

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CAH said:
Why have they used sin90?
That is the largest angle where you can observe anything and it maximizes the sine. Either something is observable at this or a smaller angle, or it is not observable at all.
CAH said:
If there is another order beam how can it be known the angel at which it exists from the zero order?
The 0th order is always at 0 degrees.
 

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