## richyw 4 years ago Can someone help me with a simple bragg reflection question?

1. richyw

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!

2. richyw

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

3. richyw

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