Explain rarer and denser medium.

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(N/A) In optics,the terms 'rarer' and 'denser' are used to compare the optical densities of two media.$1$. Optically Rarer Medium: $A$ medium in which

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(N/A) In optics,the terms 'rarer' and 'denser' are used to compare the optical densities of two media.
$1$. Optically Rarer Medium: $A$ medium in which the speed of light is relatively higher is called an optically rarer medium. In this medium,the refractive index is lower.
$2$. Optically Denser Medium: $A$ medium in which the speed of light is relatively lower is called an optically denser medium. In this medium,the refractive index is higher.
Key point: When light travels from a rarer to a denser medium,it bends towards the normal. Conversely,when it travels from a denser to a rarer medium,it bends away from the normal.

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