A light ray is totally internally reflected down an optical fibre
A cross-sectional view of a step-index optical fibre is shown in the diagram.The ray of light enters the end of the fibre and refracts along the core-cladding boundaryCalculate the angle of incidence, θ, of the ray at the point of entry to the fibre.
The speed of light in the core is 2.027 × 108 m s–1
The speed of light in the cladding is 2.055 × 108 m s–1
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