CBSE NOTES CLASS 12 PHYSICS
CHAPTER 10 WAVE OPTICS
Law of Malus
When a beam of completely plane polarised light is incident on an analyser, the intensity of transmitted light from analyser is directly proportional to the square of the cosine of the angle between plane of transmission of analyser and polariser, i.e.,
I ∝ cos2 θ
When ordinary light is incident on a polariser the intensity of transmitted light is half of the intensity of incident light.
When a polariser and analyser are perpendicular to each other, then intensity of transmitted light from analyser becomes 0.