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A disk of high-grade quartz glass approximately 2 cm (0.75 in.) thick, having at least one side ground and polished with a deviation in flatness...


= Encyclopedia Article; = Research Update
Figure 1.Optical flat being used to determine flatness of seal ring. Interference bands on the seal ring face show lines of constant depth. (Van Keuren Co.)
From Encyclopedia article 'Optical flat'
Figure 2.Measurement of height of sphere determined by means of gage blocks and optical flat. 1'= 25.4 mm.
From Encyclopedia article 'Optical flat'
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