Society of Glass Technology · [Sheffield] · leaf 395
ebetween the refractive indices of the several pieces can be measuredwith great accuracy. In order to make an actual measurement of the number ofbands shift, it is, of course, necessary to use light of a definitewave-length. It is convenient to use the mercury green line(A. = 5461 A.U.), and it is… … Fig. 2. which differs by A/* in refractive index from the standard will ben = , where t is the thickness of the block and A. the wave- A length of the light in air. For instance, if t = 1 inch = 2-54 cm.,A fi = 0-000001and a = 0-546 x 10~45-08 x 10-6 and n = 0546 X 10-4 _^, or very nearly 1/10. In…
Glass
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