Diffraction grating and wavelength

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SUMMARY

The discussion focuses on the application of the diffraction grating formula, nλ = d sin θ, specifically addressing the use of sin 90 degrees in calculations. The participant clarifies that sin 90 is utilized because it represents the maximum observable angle, ensuring that the sine value is maximized. Additionally, it is established that the zero order beam is always at 0 degrees, providing a reference point for determining the angles of higher order beams.

PREREQUISITES
  • Understanding of diffraction grating principles
  • Familiarity with the formula nλ = d sin θ
  • Knowledge of sine function properties
  • Basic concepts of wave optics
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  • Study the implications of different orders of diffraction in wave optics
  • Learn about the behavior of light at various angles using diffraction gratings
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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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