Frosted glass tokens, one side of which is screen printed with a "d" shaped object to make magnification measurements and for all experiments on image formation.
Other Specifications- Diameter: 40, 50 or 80 mm
- Thickness: 3 mm
- Glass: K9 substrat
- Treatment: frosted fine grain (2 faces)
- Mask: black silkscreen
- Object: letter "d"
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