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Using Snell's law, show that if light incident from medium 1 onto medium 2, with n₂< n₁, there exists a critical angle θ꜀-sin⁻¹ (n2/n), so that if the angle of incidence θ,- θ꜀, the angle of refraction is θτ-900. This means that the transmitted wave grazes the surface.
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