"How do you calculate the absolute index of..." was answered by our community

High School
Physics
Light and Optics
Refraction of light

Ainsley Zimmerman

Answered question

2022-05-10

How do you calculate the absolute index of refraction?

Answer & Explanation

garcialdariamcy4q

Beginner2022-05-11Added 15 answers

Absolute refractive index is the refractive index when a light ray passes from air to the given medium or from a medium to air.
We thus apply Snell's law as follows(for a ray going from air to a medium),

n_{a} \sin i = n_{m} \sin r

where

n_{m}

is the refractive index of the medium

n_{a}

is the refractive index of air
i is the angle of incidence
r is the angle of refraction
Make

n_{m}

the subject in the above equation

\Rightarrow n_{m} = \frac{n_{a} \sin i}{\sin r}

n_{a} = 1

\Rightarrow n_{m} = \frac{\sin i}{\sin r}

Also, another definition says that

n_{m} = \frac{c}{c_{m}} = \frac{s p e e d o f l i g h t i n v a c u u m}{s p e e d o f l i g h t i n t h e m e d i u m}

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