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Question

What is the velocity of light in a medium having refractive index 1.5?

A
3×108 ms1
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B
1.5×108 ms1
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C
2×108 ms1
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D
1×108 ms1
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Solution

The correct option is C 2×108 ms1
Refractive index of a medium is given by:
n=cv
where:
c:Speed of light in vacuum
v:Speed of light in the medium

v=cn
v=3×1081.5
v=2×108 ms1

Thus, speed of light in the medium having refractive index 1.5 is 2×108 ms1.

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