Measuring the angles and pyramidal error of high-precision prisms f4w|  
>/'WU79TYE  
High-precision prisms, having maximum angle tolerances g?@(+\W  
of 1 to 3 arcsec, find increasing application in optical metrology. BwBv'p+n  
Reported interferometric techniques for measuring .)W8 U [  
the wedge angles of such prisms achieve a precision of up }l[t0C t  
to 0.1 arcsec ~Ref. 1!, while noninterferometric techniques O>k.