In a certain time, light travels 6.20 km in a vacuum. During the same time, light travels only 3

step 1 Refractive index is equal to the speed of light divided in vacuum, divided by the speed of light

In a certain time, light travels 6.20 km in a vacuum. During...

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Key Concepts

Speed of Light in a Medium

This concept refers to the speed at which light travels through a specific substance, which is always lower than or equal to its speed in a vacuum. The reduced speed in a medium is due to the interactions of light with the material's atoms or molecules, and this reduction is directly related to the medium's refractive index.

Refractive Index

The refractive index is a dimensionless number defined as the ratio of the speed of light in a vacuum to its speed in a given medium. It quantifies how much the medium slows down the propagation of light compared to a vacuum, playing a key role in determining the bending or refraction of light at interfaces between different media.

Ratio of Distances and Time

When comparing light's travel in different media over the same time interval, the ratio of the distances covered in each medium directly reflects the ratio of their speeds. This principle enables the calculation of the refractive index by comparing the distance light travels in a vacuum versus in another medium during the same period.

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