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At the same time the vector group rotates about the bisectrix of the vector pair.
Without taking the leakage flow over the screw flights into account, and with other geometrical assumptions, by assuming that the bank of material at the leading flight edge is approximately symmetrical with respect to the bisectrix, and that the screw flank contacting the bank of material is reasonably flat, the axial velocity component is (12):
This position is given respectively when the bisectrix between incoming and reflected light rays stands perpendicular to the crystal face.