LIGHT

 Today i have learnt about light.
Here is the video:

Definition:

Video 1 :

             This video is about medium , Refraction , Total internal reflection and Critical angel:

*medium refers to  the substance that transfers the energy, or light from one substance to another substance or from one place to another, or from one surface to another.

* Refraction means the bending of light from one to an other .

*Medium = 2 types rarer and denser

* Rarer in which light reaches its maximum speed. Ex : Air

*Denser medium is where light reaches its minimum speed. Ex : Water 

* In a certain point the light will reflect into the water itself is known as total internal reflection.

*Critical angel = 90 degree .

You may even ask if light only travels in medium ? The ans is no because, As we know that we get light from sun , sun is in the space and space is not an medium so the light will also travel inn medium and without medium also.

Video 2 :

This video is about hologram. I have made a pyramid like 3D structure in transparent paper. This pyramid like structure will have to openings in that one will be small and the other one will be big. To make a hologram , First you should type in YouTube 2d videos,  Choose any video you want , After take your pyramid like structure and keep its small opening in the x mark that has been given in the video. You have created your  own hologram.

This trick is known as the PEPPERS GHOST EFFECT, With this simple trick they made the Micheal Jackson perform in the stage, But how is it possible? In the video i have made a small screen only. So we can only display small things but in the stage. But we need to make the projection big .  So that the audience can see . So the event organizers , Made a big 45 degree glass and had a big projector to make the projection big.