Question

define absolute refractive index and express it mathematically?​

Answer 1

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It is speed of an object in one medium with respect to other medium.

Speed in first medium/speed in second medium

Answer 2

Explanation:

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

⇒

n

m

=

n

a

sin

i

sin

r

n

a

=

1

⇒

n

m

=

sin

i

sin

r

Also, another definition says that

n

m

=

c

c

m

=

speed of light in vacuum

speed of light in the medium