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Homework Statement
see:
http://www.flickr.com/photos/[email protected]/6371848305/ [Broken]
Homework Equations
vp = w/k
vg = dw/dk
The Attempt at a Solution
I know the relationship of:
vg = vp(1+lambda/n * (dn/dlambda))
but i don't know where to go from here..
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