Light is a form of energy that allows us to see what surrounds us. It is all electromagnetic radiation that propagates in wave forms in any space, it is capable of traveling through a vacuum at a speed of approximately 300,000 kilometers per second. Light is also known as light energy. There are different sources of light that we can classify into natural and artificial. The Sun is the main natural and important source of light on Earth. As for artificial sources, we would be talking about the electric light of a bulb, the light of a candle, oil lamps, among others.
Light is emitted from its sources in a straight line and in all directions, and diffuses over a larger and larger area as it progresses. If something gets in your way, a shadow forms where the light doesn't pass; for example, in opaque bodies, light tends to pass easily through glass or water.
Like all waves, light experiences the phenomena of reflection and refraction. The reflection of light is the change that when the light beam strikes the surface of separation of two different media without leaving the means by which it spreads. Mirrors reflect light in the normal way, the light bounces back in the same way it hits and as a result you can see an image in the mirror.
The refraction of light is the change in direction of a ray of light when passing from one medium to another of different density, through which it travels at different speeds. Lenses are pieces of glass that work by refracting light.
Light has an important effect for everyone, thanks to it we can see objects, our companions, signs and symbols, among other things. Light can change the properties of bodies; For example, a white sheet of paper when exposed for a certain time to sunlight, turns yellowish.
Light allows plants and animals to develop processes to obtain energy, human beings have also learned to use it to achieve a better way of life, we use it to heat our homes, cook, etc.
