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Q.

The ratio of velocity of light in vacuum to the velocity in a given media is called .......... .


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a

Normal index

b

Reflective index

c

Refractive index

d

None of the above 

answer is C.

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Detailed Solution

The ratio of velocity of light in vacuum to the velocity in a given media is called refractive index
The ratio of the speed of light in air or vacuum to the speed of light in another medium is the refractive index of the medium. Refractive index is denoted by the Greek letter μ.
It can be written as μ=speed of light in air or vacuumspeed of light in the medium
Refractive index has no unit since it is a pure ratio.
 
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