CONFIGURATION: DISC, PLANO-CONCAVE
DIAMETER: 20.00mm + 0.00mm /- 0.10mm
EDGE THICKNESS: 6.35mm +/- 0.10mm
CENTERING ERROR: 5 ARC MINUTES MAXIMUM.
SPHERICAL RADIUS: 1000.00mm +/- 5.00mm CONCAVE
SURFACE ACCURACY: 1/4 WAVE MAXIMUM AT 0.633um,
2 FACES.
SURFACE QUALITY: 20-10 PER MIL-O-13830, 2 FACES.
SURFACE ROUGHNESS: 30 ANGSTROMS Ra MAXIMUM,2 FACES
MATERIAL TYPE/QUALITY: ZINC SELENIDE, LASER GRADE.
COATING: NONE, UNCOATED SUBSTRATE.