Question

What are three uses of polaroid?

Answer 1

Hint: We should understand what the given material or the device is to analyse and find the different uses for the same. We need to understand their working and conditions of working to find the solution to this problem on the uses of a polaroid.

Complete answer:
The polaroid are devices of chemically active sheets of
plastic which can be used to polarise a beam of randomly polarised light. The polarization is the process or the phenomenon by which an object eliminates all the elements of the light which are not parallel to the transmission axis in the object. The light from a random source is a mixture of radiations with its electric field and magnetic field oscillating in all the possible directions without any order or directionality.
An optically active material, which is also known as a polaroid, will allow the light beams which have the electric field vector to be parallel to the transmission axis. A polaroid can have two transmission axes, known as bi-polaroid, or even more. This property of the material is utilised by us in order to obtain different types of colours or radiation from a source. The main three uses are –
1.They are used in sun glasses so that the polaroid used in them filters away the ultraviolet and other high energy (blue region of visible spectrum) from harming the eyes.
2.The polaroid is used in laboratories to observe and study the polarization patterns and different characteristics for the same.
3.The polaroid are used in decoration and in cameras as filters to produce effective vision.
This is the required solution.

Note:
The polaroid was used for marking photos as a photographic film in the earlier times. They are very expensive and thus polaroid photography didn’t become a success. Today, they are used in sunglasses, laboratory instruments and other filtering purposes.