What is rarer medium and denser medium
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The medium with high optical density is called denser mediumThe medium with low optical density is called rarer medium
A medium with low optical density is known as an OPTICALLY RARER medium. This medium has lower refractive index and speed of light is high here. Whereas, a medium with high optical density is known as an OPTICALLY DENSER medium. This medium has higher refractive index and speed of light is low here. Eg :- Air is an optically RARER medium and diamond is an optically DENSER medium.
The medium in which light bends towards the normal is known as denser medium and in which it moves away from the normal it is known as rarer medium, for example- air is rarer and water is denser medium as compared both of them.