# GENERAL KNOWLEDGE

## GK

### PHYSICS

 Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What is refractive index?
 A it is defined as the product of speed of light in medium and in vacuum B it is defined as the ratio of speed of light in vacuum to the speed of light in the medium C it is defined as the ratio of speed of light in the medium to the speed of light in vacuum D None of above
Explanation:

Detailed explanation-1: -The refraction of light in a given medium can be expressed in terms of a factor called the refractive index of the medium. Refractive index of a medium is defined as the ratio of the speed of light in a vacuum to the speed of light in the medium. It is also called the index of refraction.

Detailed explanation-2: -Refractive index is defined as. The ratio of the speed of light in a vacuum to its speed in a specific medium. Refractive index is also referred to as refraction index or index of refraction. The speed of light in a medium depends on the properties of the medium.

Detailed explanation-3: -Refractive index of a medium is defined as ratio of speed of light in vacuum to that in the medium. It is a dimensionless quantity that describes how the light travels in the medium. =vc.

Detailed explanation-4: -Note:Two types of refractive index Relative refractive index– It is the ratio of speed of light in one medium to the speed of light in another medium. The absolute refractive index is defined as the ratio of the speed of light in vacuum and in the given medium. The absolute refractive index should never be less than 1.

Detailed explanation-5: -Absolute refractive index of a medium is defined as the ratio of the velocity of light in vacuum to the velocity of light in the medium. If c is the velocity of light in vacuum and v in the medium, then n = c/v. The relative refractive index between a pair of media is the ratio of their absolute refractive indices.

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