We can write:
η1/η2 = sinθ2/sinθ1
Define θ1 = θc, where θc is the critical angle.
Consider a beam of light travelling from a medium with a low index of refraction n1 to a new medium with a higher index of refraction n2. Use Snell’s Law to explain why total internal reflection will never occur in this situation, regardless of the choice of incident angle.
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