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Malus Law


Un-polarized light gets linearly polarized when it passes through a polarizer. When, a linearly polarized light passes through another polarizer (called analyzer), the intensity of transmitted light depends on the angle $\theta$ between polarization axis and analyzer axis. The intensity of the transmitted light is given by Malus's law \begin{align} I=I_0\cos^2\theta, \end{align} where $I_0$ is the intensity of the incoming light and $\theta$ is the angle between the polarizer and the plane of polarization of the incoming light.

Malus law


  1. Polarization
  2. Transverse nature of light
  3. Laser light is polarized
  4. Photography with polarizer
JEE Physics Solved Problems in Mechanics