Define polarisation of light and plane of polarisation. Distinguish plane polarised, partially polarised light and unpolarised light.

Briefly describe Brewster’s law and relate it to the critical angle. Show that reflected and refracted light vibrate mutually perpendicular to each other.

Write various methods to get polarised light. Explain utility of polarised.

What is the Brewster angle for water? The refractive index of water with respect to air is $1.33$.

What is the polarising angle for a medium of refractive index $2.4$?

What is the angle of incidence, if the reflected rays of light falling on a thick transparent plate of refractive index $\sqrt{3}$ are completely polarised? Does this angle depend upon the wavelength of light?

Light rays strike a glass plate at $57°$ incidence. If the reflected and the refracted rays are mutually at right angles, what is the refractive index of glass?

A ray of light is incident on the surface of a glass plate of refractive index $1.5$ at the polarising angle. What is the angle of refraction?

A light-ray is incident on a glass plate of refractive index $1.54$. If the reflected ray is completely plane polarised, then determine angle of incidence.

(Given: $\tan {57}^{\circ }=1.54$ and $\sin 40{.5}^{\circ }=0.6493$).