ys is zeroor nearly zero, while in other parts it may be many wave-lengths; but in some, as with a thin film whose thickness isuniform but amounts everywhere to say more than six or eightwavelengths, the difference in path is always relatively large.In cases of the latter sort, fringes are… … Figure 84 ence in path is quite small, but none whatever in the rest ofthe field. Consider, for example, Newtons rings. Here thethickness of the air-film ranges from zero, where the lens andthe flat disc come into contact, to larger and larger values aswe recede from that point. Figure 84B is a…
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