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3. The critical angle for total internal reflection at a liquid-air interface is 48.6º. If a ray of light travelling in the l

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Air (12) Oc = 48.69 909 By snells law Liquid 0;FOC ni sin oc h₂ singo° ni (Sin 48.6) = 1 singoo - n,= Sin 48.6 In = 1.33 AirAir (12) iOi Liquid (62) Oi - 40° N₂sin oi =n, sinor LX Sin 40° =(1-33) sino Sin 40° Op = Sin [ 1.33 Or - 28.90

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