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The critical angle for the boundary between two materials (such as the core and cladding of an optical fibre) is: θc = arcsign(n2/n1) Where n2 is the refractive index of the cladding layer. and n1 is the refractive index of the core layer. If we use a simply unclad fibre where the core has n1=1.50 and the air surrounding it forms a layer of n2=1.00 θc = 41.8 degrees.

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Q: What is the critical angle of a cladding?
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