You are Here: Home >< Physics

# Physics AS question! Diffraction gratings!

Announcements Posted on
Why bother with a post grad? Are they even worth it? Have your say! 26-10-2016
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.

## Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
1. Oops, you need to agree to our Ts&Cs to register

Updated: May 16, 2016
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Today on TSR

### Who is getting a uni offer this half term?

Find out which unis are hot off the mark here

### Brexit: Why you should study law

Poll
Study resources

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.