alleryThe refractive index of a medium is defined as:
ASpeed of light in medium / Speed in vacuum
BSpeed of light in vacuum / Speed in medium
CSpeed of light × frequency
DSpeed of light × wavelength
Answer & Solution
Correct answer: B. Speed of light in vacuum / Speed in medium
n = speed of light in vacuum (c) / speed in medium (v).
Light slows down in denser media, so n > 1 always.
Water n = 1.33, glass n = 1.5, diamond n = 2.42.
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