Polished 90 mm dia & 20 mm thick approx.
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Diffraction Gratings replica mounted on a plate glass.. 2400 (lines/in) 7500 (lines/in) 15000 (lines/in)
Kit includes 5 liters round bottom flask with cork, support ring, fluorescein and 3 lens to demonstrate long, short and normal sight.
Plane, circular, ground edges. Back silvered with protective coating
Optically worked, ground edges
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