Observation is the first step of a new inventor

What is meant by light?

Light is the portion of electromagnetic radiation that is visible to the human eye, responsible for the sense of sight. Visible light has a wavelength in a range from about 380 or 400 nanometres to about 760 or 780 nm[1], with a frequency range of about 405 THz to 790 THz. In physics, the term light often comprises the adjacent radiation regions of infrared (at lower frequencies) andultraviolet (at higher), not visible to the human eye. 
Primary properties of light are intensity, propagation direction, frequency or wavelength,polarization, and phase, while its speed, about 300,000 kilometers per second in vacuum, is one of the fundamental constants of nature.
Light, which exists in tiny "packets" called photons, exhibits properties of both waves and particles. This property is referred to as the wave–particle duality. The study of light, known asoptics, is an important research area in modern physics.

Now let us learn some properties of light.


When light ray travel from one transparent medium to another transparent medium it bends from its original path this is called as refaraction.You can examine it more by looking at below diagrams.

Instances where refraction of light is occur.[click those topics to get more information on refraction]

Reflection of light

Reflection is define as the bouncing back of a ray of light into the same medium, when it strikes a surface.It occurs almost all the surfaces but Marjory in shiny surfaces such as mirrors,shiny metals etc.Other reflects a part of it, while absorb the rest.

Reflection of light from surfaces is govern by the 2 laws of reflection

  1. The incident ray, reflected ray and normal at the point of incidence lie on the same plane.
  2. The angle which the incident ray makes with the normal (angle of incidence) is equal to the angle which the reflected ray makes with the normal (angle of reflection).

Here are descriptions for the terms of the diagram

  •  The ray of light which strikes the surface is called the incident ray.
  • The ray of light which leaves the surface is called the reflected ray.
  • A line perpendicular to the surface is imagined at the point of reflection. This line is called a normal. In this context the word normal means perpendicular. In the above diagram the normal is colored blue.
  • The angle between the incident ray and the normal is called the angle of incidence, or the incident angle.
  • The angle between the reflected ray and the normal is called the angle of reflection, or the reflected angle.
The speed of light = 29A9 792 458 m / s