When unpolarised light is incident on two crossed polarisers, no light it transmitted. A student asserted that if a third polariser is added transmission of light will occur. Does this make sense? How can adding a third filter increase transmission?

An unpolarised light is incident at angle of polarisation on a reflector. Determine the angle between the reflected and the transmitted rays.

How does an upolarised light incident on a polaroid get polarised? Describe briefly, with the help of a necessary diagram, the polarisation of ligtht by reflection from a transparent medium.

Distinguish between unpolarised light and linearly polarised light. How does one get linearly polarised light with the help of a polaroid?

When light is polarised, how does its intensity change?

A light is incident on a glass -block at a polarisation angle How does this polarisation angle change with the wavelength of light?

(i) State Brewster's law. (ii) An unpolarised light is incident at angle of polarisation on a reflector. Determine the angle between the reflected and the transmitted rays.

Show, giving a suitable diagram, how unpolarised light can be polarised by reflection.

Why does unpolarised light from a source show no variation in intensity when viewed through a polariod which is rotated? Show with the help of a diagram, how unpolarised light from sun gets linearly polarised by scattering.

Two polaroids P_(1) and P(2) are placed with pass axes perpendicular to each other. Unpolarised light of intensity I_(0) is incident on P_(1) . A thrid polaroid P_(3) is kept in between P_(1) and P_(2) such that its pass axis makes an angle of 45^(@) with that of P_(1) . Determine the intensity of light transmitted through P_(1) , P_(2) "and" P_(3).

You are given two thin sheets of tourmaline crystal. Explain, how you can show polarisation of light with their help