Question

a.what is refractive index? 2marks
b.what is absolute refractive index? 1marks
c.explain by giving any one example. 2marks

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Answer 1

Refractive index is the ratio of the amount of light propagation through different media
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Answer 2

a. The ratio of the velocity of light in a vacuum to its velocity in a specified medium.
b. A number indicating the speed of light in a given medium as either the ratio of the speed of light in a vacuum to that in the given medium (absolute index of refraction) or the ratio of the speed of light in a specified medium to that in the given medium.
c. An example of a plasma with an index of refraction less than unity is Earth's ionosphere.


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