This question on light waves was popular among the candidates and was well attempted
The expected answers are:
(a) Waves other than light that can be plane polarized
Radio waves
X - rays
§ – rays
Ultraviolet rays
Infrared rays.
(b) Methods of polarizing an unpolarized light
- Reflection(from smooth surface)
- Double refraction(through crystals)
- Selective absorption(in certain crystals)
- Scattering (by small particles)
- Polaroid.