Polarisation

At the angle of incidence greater than the polarising angle, the refracted and reflected rays are perpendicular to each other.

For a given polariser, the polarising angle is $45°$. Choose the angle of incidence for which the ray of light will get partially reflected.

If light strikes an interface so that there is a $90°$ angle between the reflected and refracted rays, the reflected light will be linearly polarised.

What happens to the intensity of the unpolarised light when it is passed through a Polaroid?

Polaroids can decrease the intensity of light.

What is the role of polariser?

The reflection index of water is $4/3$ and that of glass $3/2$. A beam of light travelling in water enters into glass. At the angle of incidence, the reflection ray will be pillorized$\left[{\tan }^{-1}\left(1.3\right)=48°\right]$. 

Yellow light indicate on smooth surface of block of dense fliest glass for which refractive index is $1.66$. Angle of refraction is ($(\mathrm{if} {\tan }^{-1}(1.66)=59°)$ 

At what angle in degree will light travelling in air be completely polarised horizontally when reflected from water? (Use:$n_{\mathrm{air}}=1$, $n_{\mathrm{water}}=1.33$ and $n_{\mathrm{crown} \mathrm{glass}}^{\text{'}}=1.520$)

The reflected light will be linearly polarised:

A polarized light of intensity $40 W{m}^{-2}$ is incident on the analyser at a certain angle. if the transmitted beam has an intensity of $20 W{m}^{-2}$, the angle made with the vertical is _____

An unpolarized light can be polarized by _____.

Linearly polarised light is obtained by _____ (Reflection/Refraction/Scattering/Dispersion) of light.

Define the term "Linearly polarised light".

A _____ is a device that allows only one half of the vibrations of the transmitted light to pass through the filter only in one plane. 

Mention two application of polaroids.

 What principle is responsible for the fact that certain sunglasses can reduce glare from reflected surfaces?

What is Brewster angle?

At polarising angle, the angle between the reflected ray and refracted ray from a surface is $90°$.

At polarising angle, the angle between the reflected ray and refracted ray from a surface _____ degree.