the critical angle of Perspex was found to be 45°. The refractive index of Perspex. The refractive index of air is 1.0. Use Snell’s law of refraction.
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Explanation:
Perspex has a refractive index of 1.495 and polystyrene has a value of 1.591. If we calculate the ratio of sin(angle of incidence) / sin(angle of refraction) we obtain the constant that we call the refractive index.
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