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Question

In a certain liquid, the velocity of light is found to be 2.50×108 ms1. Find the absolute refractive index of that liquid.


A
1.3
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B
1.5
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C
1.2
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D
1
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Solution

The correct option is B 1.2
Given:
Speed of light in liquid, vl=2.5×108 m/s

Let nl be refractive index of liquid wrt vacuum.
Speed of light in vacuum is c=3×108 m/s

From definition of refractive index,
nl=cvl
nl=3×1082.5×108
nl=1.2

Physics

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