Answer:
Step-by-step explanation:
1.) Ratio of the speed of light in a vacuum to the speed of light in a medium is called refractive index. It is also known as index of refraction. It is a measure of light ray as they travel from one medium to another medium. We can determine the nature of a pair of media through their refractive indices.
2) Rule for how light is refracted at the boundary between two materials is known as the Snell's law. Snell's law states that the ratio of the angle of incidence to the angle of refraction is a constant for a given pair of media. The angle incidence is greater than the angle of refraction if the light ray travels from less dense medium to a denser medium and lesser than the angle of refraction if the light ray travels from denser medium to a less dense medium.
3) Process that occurs when the angle of incidence is greater than the critical angle is known as Total internal reflection. Total internal reflection only occurs when light rays travels from a denser medium to a less dense medium.
4.) Path of a particle of light is known as Ray. A ray is a particle of light that emerge from the sun or a reflecting (luminous) body. They are in form of straight lines striking the surface of a body.
5.) Dispersion is defined as the separation of white light into into component color. This is accompanied with the use of a triangular glass prism. The white light is an example of electromagnetic spectrum. The component colors are known as ROYGBIV (Red, Orange, Yellow, Green, Blue, Indigo and violet.). This combination of colors are called rainbow.
The separation of light into different frequencies to produce a rainbow is therefore known as DISPERSION