Reflecting and limiting sphere in diffraction

asdf1
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What is the purpose of the reflecting and limiting sphere in diffraction?
 
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asdf1 said:
What is the purpose of the reflecting and limiting sphere in diffraction?
This may not be crystal clear, but maybe with what you already know it will get you going in the right direction. Obviously, you need to have a basic understanding of reciprocal space for this to make any sense at all.

http://www.eng.uc.edu/~gbeaucag/Classes/XRD/ReciprocalRoadMap.html

http://commons.wikimedia.org/wiki/Diffraction
 
Understanding a little better, but it's still hard to picture things~
 

Thread 'Modeling a graph that shows age in relation to depth of an ice sample'

To solve this, I first used the units to work out that a= m* a/m, i.e. t=z/λ. This would allow you to determine the time duration within an interval section by section and then add this to the previous ones to obtain the age of the respective layer. However, this would require a constant thickness per year for each interval. However, since this is most likely not the case, my next consideration was that the age must be the integral of a 1/λ(z) function, which I cannot model.
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