Discuss with a suitable diagram the procedure of production of polarised light using some glass plates.

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

Discuss role of water and light in production of food in plants.

Using de Broglie's hypothesis , explain with the help of a suitable diagram , Bohr's second postulate of quantisation of energy levels in a hydrogen atom.

The light from a clear blue portion of the sky shows a rise and fall of intensity when viewed through a polaroid which is rotated. Describe, with the help of a suitable diagram, the basic phenomenom/process which occurs to explain this observation.

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.

How is linearly polarised light obtained by the process of scattering of light? Find the Brewster angle for air-glass interface, when the refractive index of glass = 1.5

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.

Some halogen containing compounds are useful in daily life. Some compounds of this class are responsible for exposure of flora and fauna to more and more of UV light which causes destruction to a great extent. Name the class of these halocompounds. In your opinion, what should be done to minimise harmful effects of these compounds ?

A ray of light incident on a medium at polarising angle.what will be the angle between the reflected and the refracted rays? Or, an unpolarised ray of light is incident on a rectangular glass block at Brewster's angle. What will be the angle between the reflected and the refracted rays?