Question

which has a higheat refractive index ​

Answer 1

diamond is a substance which has a refractive index of 2.42

it is one of the substance present in nature which has highest refractive index

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Answer 2

Under natural conditions, the record highest refractive index is 4.05 for the element Germanium, but in the IR range only. It drops to lower values in the visible region and others. Even a well-tailored man-made structure is limited to a frequency range for its best refractive performance.

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