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Actually we define refractive index with respect to a standard medium. Air has been taken as that standard. Hence refractive index of air is 1 and that of water is 1.33. But refractive index of water with respect to glass is 1.33/1.5 = 0.887

So, the answer is "water".

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What has the highest index of refraction a vacuum a diamond air or crown glass?

Diamond has the highest index of refraction among vacuum, diamond, air, and crown glass. It has an index of refraction of around 2.42, which is higher than that of air (1.0003), vacuum (1), and crown glass (around 1.5).


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The index of refraction of air at room temperature is approximately 1.0003.


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The index of refraction is a measure of how much light slows down when passing through a medium. In solids like glass, the atoms are closely packed together, causing the light to interact more with the atoms and slow down more than in air where the atoms are more spread out. This difference in atomic arrangement leads to a higher index of refraction in glass compared to air.


Discussion of reflactive index of glass and water?

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