Question

Does the formula for Snell's Law change if light passes from a denser medium to a less dense medium, instead of it passing the other way around?

Answer 1

Answer:

When light travels from a medium with a higher refractive index to one with a lower refractive index, Snell's law seems to require in some cases (whenever the angle of incidence is large enough) that the sine of the angle of refraction be greater than one.

Answer 2

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When light travels from a medium with a higher refractive index to one with a lower refractive index, Snell's law seems to require in some cases (whenever the angle of incidence is large enough) that the sine of the angle of refraction be greater than one.