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Answer» Answer: sin⁻¹(8/9) Explanation: REFRACTIVE INDICES of glass and water are 1.5 = 3/2 and 4/3. From SNELL's law, μ₁ sinθ₁ = μ₂ sinθ₂ The critical angle, θₙ = sin⁻¹(μ₁/μ₂) = sin⁻¹(4/3 * 2/3) = sin⁻¹(8/9) |
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