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Question
The refractive index of glass, when a ray of light travels from air to glass is 1.5. Calculate the refractive index when light travels from glass to air.
Numerical
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Solution
\[ {}^{a}\mu_{g} = \frac{1}{{}^{g}\mu_{a}} \]
\[ \text{or } 1.5 = \frac{1}{{}^{g}\mu_{a}} \]
\[ \text{or } {}^{g}\mu_{a} = \frac{1}{1.5}\]
= 0.67
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