Question

What is called the absolute refractive index of a medium ? Obtain the general from of Snell's law in terms of refractive indicec of two media?

Page 45 Chapter - 2.Reflection and Refraction

Answer 1

Answer:

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Answer 2

Answer:

The ratio of the speed of the light in vacuum to the speed of light in a given medium is called the absolute refractive index of that medium.

$n=\dfrac cv$.

where,

• $c$ = speed of light in vacuum.

• $v$ = speed of light the medium.

It is the refractive index of that medium in vacuum.

Snell's law defines the relationship between the direction of a ray of light when it passes though a boundary of two media and the refractive indices of those media.

It states that, when a ray of light passes from one medium to another medium, then,

$n_1\sin\theta_i=n_2\sin\theta_r$

where,

• $n_1,\ n_2$ = absolute refractive indices of first and second medium respectively.

• $\theta_i,\ \theta_r$ = angle of incidence and the angle of refraction of light ray with respect to the normal to the boundary of two media respectively.

Therefore, Snell's law can also be written as

$\dfrac{\sin\theta_i}{\sin\theta_r}=\dfrac{n_2}{n_1}.$