Question

The ray of light is incident on glass slab at polarising angle 58° calculate change in velocity of light in glass

Answer 1

A ray of light is incident on the surface of a glass plate of thickness t. if the angle of incidence a is small, the emerging ray would be displaced sideways by an amount=?(let n be the refractive index of glass)

Answer 2

Given that,

Polarising angle is 58 degrees.

To find,

The change in velocity of light in glass.

Solution

The relation between polarising angle and the refractive index is given by :

$n=\tan i_p\\\\n=\tan (58)\\\\n=1.6$

Let v is the speed of light in glass. It is given by :

$v=\dfrac{c}{n}\\\\v=\dfrac{3\times 10^8}{1.6}\\\\v=1.87\times 10^8\ m/s$

The change in velocity of light in glass us :

$=c-v\\\\=3\times 10^8-1.87\times 10^8\\\\=1.13\times 10^8\ m/s$

Therefore, this is the required solution.

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The ray of light is incident on glass slab at polarising angle 58° calculate change in velocity of light in glass  ?

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