can you find the refractive index of the slab??
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A ray of light being refracted in a plastic block
In optics, the refractive index or index of refraction of a material is a dimensionless number that describes how light propagates through that medium. It is defined as
{\displaystyle n={\frac {c}{v}},} n={\frac {c}{v}},
where c is the speed of light in vacuum and v is the phase velocity of light in the medium. For example, the refractive index of water is 1.333, meaning that light travels 1.333 times faster in vacuum than in the water.
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