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A beam of light is traveling through glass with index of refraction n1 = 1.9 before...

A beam of light is traveling through glass with index of refraction n1 = 1.9 before it encounters a uniform thickness slab of plastic with index of refraction n2 = 1.4. The bottom side of the plastic is exposed to air. What is the minimum angle θ at which no light will come out from the bottom of the plastic slab?

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