Answer:
b. reading data from your computer's hard drive
Explanation:
Reading data from compact hard disc is an operation which is based ob kerr effect or Faraday effect . This effect involves rotation of plane of polarization of light when light passes through a magnetic field. In order to read data from disc , a low intensity laser light is made to fall upon the disc . On reflection,
the plane of polarization of laser light is rotated . The extent of rotation depends the extent of magnetization of magnetic disc. In this way information stored in the form of magnetic field is converted into information in the form of light .
