| http://www.w3.org/ns/prov#value | - An example of such an embodiment is shown in FIG. 8, where diffraction grating 150 is of the type which diffracts light at an angle which is dependent on the wavelength of the light (diffracted beam 152 and diffracted beam 154 strike image plane 32 at different locations, which depend upon the wavelength of each beam).
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