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# AQA-a mod4 diffraction help! watch

1. 13.1.7 on the spec.

The plane transmission diffraction grating at a normal incidence
Derivation of dsinθ=nλ

What exactly do I need to know, and what is it on about I have gone through my various books and notes, and can't find anything that seems relevant
2. you basically need to know how to derive this formula, usually using a diagram showing a two waves being diffracted whre the path difference between them in nλ.

i think there is a diagram of this in the small module booklet, if you have one of these

you also need to know how to use the formula, for example i saw a quetion where it gave you the order number (n) the angle (θ) and λ, and you had to calculate the number of lines on the diffraction grating per metre. which is equal to 1/d

hope that helpsif your still stuck, i might be able to email you the diagram
3. Thanks Gemm, see you at leeds perhaps I have the small booklet i will have another look.

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