Question

Ray of light is incident on a glass slab at polarising angle 58 degree calculate the change in velocity of light in glass

Answer 1

$the \: light \: travela \: in \: a \: stright \: line$

58 per cent of gas has meed

58?=x=29

Answer 2

Given that,

Ray of light is incident on a glass slab at polarising angle 58 degree .

To find,

We need to find the change in velocity of light in glass.

Solution,

Let us assume that the velocity of light in glass is v. It is given in terms of refractive index as :

$v=\dfrac{c}{n}$ ....(1)

c is speed of light and n is refractive index

n is given in terms of polarising angle as :

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

Put in equation (1). So,

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

The change in velocity of the light in glass is therefore given by :

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

So, the change in velocity of light in glass is $1.13\times 10^8\ m/s$.

Learn more,

Refraction

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