Ronchi Ruling 200 Lines/mm
Transmission Grating 200 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.
Sodalime 1.5mm thick
76mm x 25mm
Black Anodised Aluminium Slide (76mm x 25mm x 1.5mm)
Low reflective chrome on glass
0.0025mm ± 0.0005mm