Misconceptions about Bragg scattering and how it works

[RJLiberator]

Homework Statement

Briefly describe how diffraction through a crystal lattice could be used to isolate a single wavelength from X-rays of many wavelengths.

Homework Equations

Bragg's equation: 2dsin(Θ)=n*λ

The Attempt at a Solution

Pretty fundamental question for the lab that I am about to go through. Instead of trying to just get by this answer, I wanted to come here and ask for some opinions and learn what I could.

Here's, so far, my early understanding:
At certain incident angles, and at certain wavelengths, diffraction through a crystal creates constructive interference. Using Braggs equation, we can then find the wavelength by plugging in the angle theta, d, and maxima.

 

[SataSata]

If I'm not wrong the Bragg's equation denotes the path difference between two waves being scattered by different atoms. So certain angle of incidence will cause certain wavelengths of X-rays to form destructive interference, leaving only the wavelength of X-rays that you want. I believe it is possible to calculate the required angle by using the Bragg's equation.

 

[KaranTheGreat]

Bump. I thought I knew the answer but I was very far off.

 

[RJLiberator]

Bump. I thought I knew the answer but I was very far off.

Out of curiosity, what was it that you thought you knew, that turned out to be wrong?
This may motivate the conversation further. =)