Question

Can someone help me with a simple bragg reflection question?

Answer 1

X rays scattered from a crystal have a first-order diffraction peak at θ = 15°. At what
angle will the second and third order peaks appear?

I have already found that taking arcsin(2sin15) and arcsin(3sin15) get the correct answer. I just have no idea why!

Answer 2

the only formula my textbook gives is \[n \lambda=2dsin \theta \]
It doesn't say what n is other that "an integer"

Answer 3

never mind, wikipedia explained it. super easy once I realized what n was.