When a given light beam is passed through a polaroid and polaoid is rotated about the incident light axis, what are the three possiblities ?

Explanation

(i) There may be no change in intensity of emergent light, the incedent light is unpolarised.
(ii) There may be change in intenstiy of emergent light with minimum not equal to zero. The incident light is partially polarised.
(iii) There may be change in intensity of light with minimum equal to zero. The incident light is plane polarised.