Grades 8th - 12th by Ankush Naskar
Instructions : Drag the torch to different positions to see how the light ray refracts through different substances
What is Refraction?
Refraction is the bending of light as it passes from one transparent medium to another. Due to the difference in density of the two mediums, the speed of light changes as it enters the second medium and it changes direction.
What is Incident Ray? What is Emergent Ray?
A ray of light that enters a medium is called the incident ray. After refraction, the ray of light that leaves the medium is called the emergent ray.
What is Refractive Index?
The refractive index is a property of a medium through which light can pass.
Its value is calculated from the ratio of the speed of light in vacuum to that in the medium.
For example, the refractive index of glass is 1.516 and that of water is 1.333.
The amount of bending of light during refraction depends on the difference between the refractive indexes of the mediums across which the light is traveling.