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In a given medium the speed of light is ...

In a given medium the speed of light is `2/3rd` of its speed in vacuum. The absolute refractive index of the medium is:

A

`3/2`

B

`9/4`

C

`4/9`

D

`2/3`

Text Solution

Verified by Experts

The correct Answer is:
A
Let Speed of light in air or vaccum= x
Speed of light in the given medium = `2/3 x`
Since, `n_m = ("Speed of light in air")/("Speed of light in the medium")`
`= C/V`
`n_m = x/((2/3 x)) = 3/2`
Therefore, refractive index of the medium is
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