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Question

Relative refractive index can be:


A

equal to 1

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B

greater than 1

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C

smaller than 1

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D

None of these

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Solution

The correct options are
A

equal to 1


B

greater than 1


C

smaller than 1


Relative refractive index of medium A w.r.t to medium B is the ratio of their absolute refractive index(R.I.)

Let R.I of medium A and medium B be μA and μB respectively.

BμA=μAμB=VairVA×VBVair=VBVABμA=VBVA
If VB=VABμA=1
If VB>VABμA>1
If VB<VABμA<1
Hence, the correct options are A, B and C.


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