Measuring the angles and pyramidal error of high-precision prisms eV;r /4  
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High-precision prisms, having maximum angle tolerances A2_ut6&eb  
of 1 to 3 arcsec, find increasing application in optical metrology. o+A7hBM^  
Reported interferometric techniques for measuring 5E!C?dv(z  
the wedge angles of such prisms achieve a precision of up <Xf6?nyZ(  
to 0.1 arcsec ~Ref. 1!, while noninterferometric techniques })g<I+]Hf9  
have a precision of up to 2 arcsec ~Ref. 2!. Reported noninterferometric 3Cf9'C  
methods have made use of goniometers,2 5cSiV7#Y:  
spectrometers,3 master prisms,4,5 and collimators.6 However, "TZq")-  
in the literature there are few reported methods for S|85g1}t  
measuring the pyramidal error, and the majority rely on S}6Ld(_  
visual observation,2,7,8 by which it is only possible to measure h\s/rZg=r  
pyramidal errors to the order of 1 arcmin ~Ref. 8!. &Mh.PzO=b  
In the new arrangement presented here, one can measure YIQD9  
the prism angle and the pyramidal error separately or in ]#tB[
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combination. This is possible because the measurements inP2y