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Angle of incidence / angle of refraction practice problems

Light travels from fiber optic cable into air with an angle of refraction (θr) of 11.9 °. What is the angle of incidence (θi) if the refractive index of fiber optic cable is 1.6 and the refractive index of air is 1.

The angle of incidence is: ° (Give your answer to the nearest 10th of a degree)

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I worked it out on paint so that i can write it myself.

 

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