| http://www.w3.org/ns/prov#value | - In accordance with one preferred embodiment of the present invention, the beam of radiation supplied from radiation source 1600 has a narrow wavelength band about a given central wavelength, and the object 1602 is substantially uniform in material and other optical properties, causing the phase of the radiation transmitted through object 1602 to be proportional to thickness of the object 1602.
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