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A prism with an apical angle of 30 degrees and an index of refraction of 1.52...

A prism with an apical angle of 30 degrees and an index of refraction of 1.52 is placed in air. For a ray of light that hits the surface of the prism perpendicularly, what is the angle of deviation? At what incident angle is the angle of deviation for this prism the smallest? What is the minimum angle of deviation for this prism?

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