Talk:Cladding (fiber optics)

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NA
That NA equation is easy to derive: The NA of the fiber is given by $$n \sin \theta$$. To get TIR on the wall, the angle isn't $$\theta$$ but the angle opposite $$\theta$$. The sine of that angle is the cosine of $$\theta$$ and so is equal to $$\sqrt{1-\sin^2\theta}$$. Then plug and chug. —Ben FrantzDale (talk) 20:42, 28 November 2011 (UTC)