CONFIGURATION: DISC, PLANO-CONCAVE
DIAMETER: 23.01mm +/- 0.10mm
EDGE THICKNESS: 2.95mm + 0.025/-0.00mm
CENTER THICKNESS: 2.08mm REF.
ANNULAR DIAMETER(CONCAVE FACE): 19.05mm +/- 0.50mm
SPHERICAL CONCAVE RADIUS: 50.00mm
CENTERING ERROR: 3 ARC MINUTES MAXIMUM.
SURFACE ACCURACY: POWER: 5 FRINGES MAXIMUM,
2 FACES.
IRREG: 1 FRINGE MAXIMUM,
2 FACES.
SURFACE QUALITY: 60-40 PER MIL-O-13830, 3 FACES.
MATERIAL TYPE/QUALITY: BK-7 GLASS, GRADE A,
FINE ANNEALED.
COATING: NONE, NOT REQUIRED.