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# Physics AS question! Diffraction gratings! watch

1. Jsut one question

With diffraction gratings you get orders right?
So between the first order and zero order the angle is theta.
Is the angle between the first order and second order also theta?
If this is true then is the angle between second order and zero order, 2 theta?
HELP! Its really silly but I jsut need an answer
2. I'm assuming you know the equation nλ=dsinθ . When n represents the gap between the orders. So between orders 0and 1 n=1, between orders 0 and 2 n=2, and so on... Now answering your question, between orders e.g 4 and 5 n=1 because there is a gap of one order between them. This allows you to find θ when you don't know what number the orders given to you are (although you do know they are consecutive).
So based on this, you are right!
Hope this helped a little, but I'm tired, so apologies that it's not the clearest explaination! 😃
3. NO, think about it. The length of the height between the order changes whilst the distance from the grating to the wall is unchanged. So the angle changes. Theta is different for each order, n , is used to compromise for this.
4. I edited some of my message, some sp mistakes.
5. if the distance between n=1 maxima and n=2 maxima = n=0 maxima and n=1 maxima then yes, you will be right.
6. How do diffraction gratings work? And how is the path difference n*lambda? :/ And if the rays are all parallel (for a particular order) then how do they overlap and interfere? Thanks
Jsut one question

With diffraction gratings you get orders right?
So between the first order and zero order the angle is theta.
Is the angle between the first order and second order also theta?
If this is true then is the angle between second order and zero order, 2 theta?
HELP! Its really silly but I jsut need an answer
It is a not silly question. If this is what is you are talking about the order.

Let say m and the wavelength is 380 nm.

So the angle between zero and 1st order is

The angle between zero and 2nd order is

8. (Original post by Ayahhh)
How do diffraction gratings work? And how is the path difference n*lambda? :/ And if the rays are all parallel (for a particular order) then how do they overlap and interfere? Thanks
It may be good not hijack other people posting. It is good to know that you are hunger for understanding

https://smartsite.ucdavis.edu/access...6-40/39-7.html
9. [QUOTE=Eimmanuel;69503080]It may be good not hijack other people posting. It is good to know that you are hunger for understanding

https://smartsite.ucdavis.edu/access...tml&#91;/QUOTE]
You're rightt! Oops that really wasn't my intention, thanks for letting me know and thank you very much for the link
10. (Original post by Ayahhh)
You're rightt! Oops that really wasn't my intention, thanks for letting me know and thank you very much for the link
No problem.

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