Question: Please explain and show work and steps! Thanks, I will thumbs up immediately! The speed of light in plastic is 1.9 x 108 m/s. When

Please explain and show work and steps! Thanks, I will thumbs up immediately!

The speed of light in plastic is 1.9 x 108 m/s. When light in air is incident onto the plastic at 21 degrees, which of the following is the refraction angle? 15.6 degrees 13.1 degrees 24.8 degrees 34.5 degrees

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