Ronchi Ruling 50 Lines/mm
Transmission Grating 50 Lines per mm
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Typically used for testing of resolution, field distortion and parfocal stability, but may be paired to provide interference patterns (fringe patterns) and as light gates.
B270 1.5mm thick
50mm x 50mm
Vacuum Deposited Chrome on Glass
Ruled over 30mm wide central strip
10µ ± 2µ