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Using the refractive-index table, which of the following substances has the highest absolute refractive index?
ARuby
BWater
CCrown glass
DDiamond
Answer & Solution
Correct answer: D. Diamond
1. Read the listed absolute refractive indices: water 1.33, crown glass 1.52, ruby 1.76.
2. Diamond is listed at 2.42, the largest value in the entire table.
3. A higher refractive index means light slows down the most in that medium.
4. Hence diamond has the highest refractive index.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 6 "Refraction of Light", p.84_
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