| http://www.w3.org/ns/prov#value | - n is a number between 1 and --l Further, the relative phase AS between the waves at Q and Q, for phase differences less-than 21r, may be expressed as AS= n(2 1r) radians, so that, from equations (2), (3) and (4): AS 7\ W; 3 (5) In equation (5 d and A are known constants and AS is measured by the photoelectric fringe detector 86, but n is an unknown integer and hence the absolute angle 0 is not de
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