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4. Fibre optics have a glass core and a coating (cladding) surrounding the core that has a slightly lower index of refraction. Shockingly, the critical angle for most fibre optics

is around 80.0°. If the index of refraction of the cladding is 1.44, then determine the index of refraction for the glass core. [2 marks]

Fig: 1

Fig: 2