A drop of liquid is on a Plexiglas half-cylinder. Using a ray of light, we determine the limiting angle of incidence, beyond which there is total reflection. We find 72 for this angle. Without liquid above the Plexiglas we found 41.1 for this angle. Calculate the refractive indices of Plexiglas and liquid.

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goutte d'un liquide inconnu plexiglas goutte d'un liquide inconnu plexiglas