Question

How will you identify with the help of an experiment whether a given beam of light is of polarized light or of unpolarised light?

Answer 1

We can use Polaroid in the experiment to determine whether a given beam of light is of polarized light or unpolarised light. We will locate the period in the path light and observe the light's intensity so that we can identify the light.

Complete step by step answer:
The polarization is the characteristic of all transverse waves. To obtain the polarization of light, we can rotate the Polaroid up to 360 degrees. The Polaroid is a special type of optical device used to convert white light into polarized light. We can't determine whether the light is polarized or polarised with naked eyes. We can experiment to observe whether a given beam of light is of polarized light or unpolarised light. In the experiment, we will use Polaroid because Polaroid is used for the polarization of light. We will place the Polaroid in the path of the light and rotate it up to 360 degrees, if the intensity of the light gets changed and becomes twice of its maximum value or becomes two times minimum, then we can say that the beam of light is completely polarized. If the light remains unchanged after passing through Polaroid, then we can say that the light beam is unpolarised. If the light passes through the Polaroid and slight variation occurs in light intensity, then we can say that the beam of light is partially polarized.

Note: In the experiment, do not forget to rotate the Polaroid up to complete a revolution that is 360 degrees and remember that the light can be polarized completely or slightly, and it depends on the intensity of light. If the large variation occurs in the intensity of light, then the light is considered as completely polarized, and if the small amount of variation occurs in the intensity, then light can be considered as slightly polarized.