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Geometry as slip proceeds
Let N = number of slip planes in the sample, d = perpendicular spacing of slip planes. During slip, both N and d remain constant.
d = (l/N) cos φ \ N d = l cos φ
N and d are constant, so l cos φ must also be constant throughout slip. Hence
l0 cos φ0 = l1 cos φ1
The same can be done for λ:
d = (l/N) cos (90º - λ) \ Nd = l sin λ
N and d are constant, so l sin λ must also be constant throughout slip. Hence
l0 sin λ0 = l1 sin λ1
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