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Geometric Optics: Snell's Law

Problem #: 1 | Variant #: 2

After passing from one material into another a light ray makes an angle of NAN E-INF o with respect to the interface surface. If it came from a medium with index of refraction 1.9 and passed into a medium with index of refraction 1.9, what angle did the ray make with the interface when it was in the first medium?

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