Question the speed of light in a transparent plastic is, Ask an Expert

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Question: The speed of light in a transparent plastic is 2.2x10⁸ m/s. If a ray of light in air (with n=1) strikes this plastic at an angle of incidence of 18.6 degrees,

Part A- Find the angle of the transmitted ray.

I am not able to get the correct answer please help me. Thanks.

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