# What is total internal reflection, definition, examples in daily life

Total internal reflection in hindiFriends, have you ever wondered what is the main reason for the shining of a diamond, when the diamond is kept in the light, it produces such a mesmerizing scene. It captivates the beholder. What is the science behind it after all? Friends, in today’s article, we are going to discuss the total internal reflection due to which the diamond looks so shiny. will understand well.

### What is Total Internal Reflection

Definition of total internal reflection – When a ray of light enters a rarefied medium from a condensing medium. So due to refraction, the refracted ray moves away from the normal. As we increase the value of the angle of incidence. In a rarer medium, the refracted ray moves away from the normal.

Means the value of angle of refraction keeps on increasing. (When the value of the angle of refraction for a certain angle of incidence becomes 90 degrees, then this angle of incidence is called the critical angle. (critical angle) )))) There comes a time when the value of the angle of incidence exceeds the critical angle. And there is complete internal reflection of the light rays.

## Examples of total internal reflection in daily life

There are many examples of total internal reflection in everyday life. The reason for shining a diamond is mainly due to total internal reflection. Since the refractive index of diamond is very high.2.4, its critical angle is only 24°.

Therefore, when light falls inside a specially cut diamond, it is completely reflected again and again on the surfaces of the diamond. When the angle of incidence on any surface inside the diamond is less than 24 °, then only that light comes out of the diamond and when this light falls on our eyes, then the diamond appears bright to us.

The reason for the Mirage in the desert during the summer season is also the total internal reflection. In the desert on summer afternoons, travelers get the illusion of having water at a distance. It is called the mirage of the desert.

The desert becomes very hot during the summer season, due to which the air in contact with the sand also expands and its density decreases.

The upper layers of the air are cold and dense. As we move from top to bottom, the layers become rarer. The light rays coming from the top of a tree, refracted by the different layers of air, which are rarer at the bottom, move away from the normal.

Gradually a situation comes when the angle of incidence for a layer of air exceeds the critical angle of the layers. So the total internal reflection of the ray becomes.

The ray of light is again converted upwards into the condensation medium. When this ray reaches the eyes of the traveler, the reverse image of the tree is visible and he gets the illusion of water.

The reason for the looming in cold countries is also the total internal reflection. When the glass is cracked, the glazed part appears shiny because the air gets filled in the cracked part which is rarer than the glass.

When light enters this layer of air from the glass, it is refracted from the denser medium to the rarer medium. If the value of the angle of incidence of the incident ray on the glass-air surface exceeds the critical angle of the glass, then total internal reflection starts.

For this reason, glazed glass appears shiny. Similarly, when a test tube partially filled with water is immersed in a beaker filled with water, the part of the test tube which does not contain water, that is, the empty part of the test tube, starts shining like silver.

The reason for this is also the total internal reflection of light. When light rays passing through the water of the beaker and incident on the empty part of the test tube, they start refraction from water to air i.e. from denser medium to rarer medium.

The angle of incidence increases with gradual tilting of the test tube and when its value exceeds the critical angle for water-air, total internal reflection of light takes place and the empty part of the test tube appears bright.

When the entire test tube is filled with water, the glow of the test tube will stop. Nowadays, in medical, optical signal transmission, sending and receiving electrical signals Optical-fibreWill be of great use.

optical fiber as well Total internal reflection in hindiWhen light has to be sent over long distances, optical fiber is used there because the absorption of light is very less in it.

this article”What is total internal reflection, definition, examples in daily life“Thank you very much for reading. That you must have got to know a lot new from this article.