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The refractive index of a transparent medium is defined as:
ASpeed of light in medium / Speed of light in vacuum
BWavelength × frequency of light
CDensity of medium × Speed of light
DSpeed of light in vacuum / Speed of light in medium
Answer & Solution
Correct answer: D. Speed of light in vacuum / Speed of light in medium
1. n = c / v, where c is the speed of light in vacuum and v in the medium.
2. Since v ≤ c, n ≥ 1 for any real medium.
3. Diamond has the highest n among natural materials (~2.42).
_Source: NCERT Class 10 Science Ch 9 §9.3.3 Refractive Index_
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