Physics · Ray Optics

A light ray enters a right-angled isosceles prism ABC (right-angled at B) normally at face AB, or with a specific angle. Consider a prism with a base angle where a ray travels through the prism parallel to its base BC and emerges grazingly along the face AC. If the angle of incidence at the first face is 30° and the ray travels parallel to the base, the refractive index of the prism is:

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