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Question

If ab is the wavefront in medium 1 and cd is the wavefront in medium 2 as light travels from medium 1 to medium 2. Let μ1 and μ2 be the refractive indexes in medium 1 and 2 respectively. Choose the correct option.


A
μ1=μ2
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B
μ1<μ2
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C
μ1>μ2
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D
Cannot predict
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Solution

The correct option is B μ1<μ2

It can be clearly seen that the wavefront travels faster in medium 1 than in medium 2.

If v1 is the speed of light in medium 1 and v2 is the speed of light in medium 2

Then, v1>v2

v1v2>1

Also, μ2μ1=v1v2>1

μ2>μ1

Hence, option (B) is correct.

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