the speed of light in air is 3×10³m/ sec and speed of light in glass is 2×10⁸m/ sec medium
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Refractive index of glass is defined as the ratio of the speed of light in vacuum to the speed of light in glass.
Refractive index of glass, n /g
= Speed of light in glass/Speed of light in vacuum
Therefore, n /g
= 2×10 /8
=3×10 /8
= 2/3
.
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