Why is the reflection angle 180 - 2θ in a Laue camera, not just θ?

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Hello, I am confused for a laue camera how the angle of reflection off of the sample is 180 -2θ, where θ is the scattering angle. How is the reflection off the sample not just θ?
 
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  • Diagram of a Laue camera setup: an X-ray source beam runs horizontally to a sample labelled Medal on a block, with a film strip on the left; two reflected rays go from the sample to the film, with the red label 180 - 2θ marking the angle between them.
    laue camera diagram.png
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