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What is difference between denser and rarer medium? what is the components of these mediums which changes the speed of light?



In rarer medium have refracting index smaller than 1. It has light deviated away from normal.
In denser medium refraction index is grater than or equal to one. It has light deviated towards the normal of incidence.
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most smallest refractive index is 1 which is the refractive index of air
Where there is vaccum the meduim is said to be rarer medium where a mass is situated the medium is said to be denser medium
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can you explain it
vaccum is nothing but empty space and in scientific way the whole medium is said to be rarer medium and the occupaid space like eg-water stored in tank the inner volume is completly filled then the medium is said to be denser medium
so you want to say that vaccum is a rare medium
then why it slows down the speed of light
as in vaccum speed of light is highest
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