Question

The ratio of velocity of light in air to the velocity of light in medium

Answer 1

Answer:

it's 1÷ epcelon times

I hope this is helpful

Answer 2

is called the refractive index of the medium.

Explanation:

Refraction is the process of change in speed of light when it passes from one medium to another whit varying optical density. This is because different media offer different optical freedom to the light waves to travel.

When the light rays pass through an optically denser medium then its speed slows down and vice-versa. There is also bending of light if it passed at any angle other that the normal to the interface of the two media.

the refractive index of a medium is generally given as:

$n=\frac{c}{v}$

where:

c = velocity of light in air

v = velocity of light in medium

also

$n=\frac{sin\ i}{sin\ r}$

where:

i = angle of incidence

r = angle of refraction

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TOPIC: optical density

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