can you specify the definition of denser and rarer medium ?
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A medium, in which the speed of light is more, is known as an optically rarer medium. If the speed of light in the medium is less, then the medium is known as optically denser medium. In other words, if the refractive index of a medium is high, it is known as denser medium and if the refractive index is low, it is known as rarer medium.