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Phase Difference

A beam of lig...

Question

A beam of light passes from medium $1$ to medium $2$ to medium $3$ as shown in Fig. What may be concluded about the three indices of refraction, $n_{1}, n_{2}$ and $n_{3}$ ?

n_{3} > n_{1} > n_{2}

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n_{1} > n_{3} > n_{2}

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n_{2} > n_{3} > n_{1}

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n_{2} > n_{1} > n_{3}

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Solution

The correct option is D $n_{2} > n_{1} > n_{3}$
Using Snell's law, $n_{2} > n_{1}$ because $i > r, n_{2} > n_{3}$ because $e > r$ , and $n_{1} > n_{3}$ because $e > i$ .

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