Refractive index of any substance is always equal to or greater than 1
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refractive index is ratio of speed of light in vaccum is to speed of light in medium and speed of light is max in vaccum so refractive index is equal or greater than 1
kshitij064:
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The light travels fastest in vacuum.
The refractive index of vacuum is taken 1.
speed of light will be lesser than vaccum , it means its refractive index can't be less than 1.
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