Light is electromagnetic radiation that the eye can see because it is responsible for the sense of sight, and the wavelength of light is from 400 nanometers to 700 nanometers, that is, between infrared and ultraviolet waves, and there are many different sources of light, whose wavelengths range from 420- 680nm to 380-800nm, humans can see infrared, whose wavelength is about 1050nm, young people and children can see ultraviolet waves whose wavelength ranges from 3103nm, the speed of light in space is estimated to be 299.792.458 meters per second .
Light is represented as a ray that travels in a straight line, and its direction changes only if an obstacle crosses its path:
It is known that light travels in a straight line from the beginning of the light source to infinity, and when the light hits an object, this object retains the energy of the light and then resends it in all directions, either by reflection during its occurrence, in mirrors and chrome as a polished surface and this is possible, refraction occurs Light when light strikes a medium different from the material in which it travels, and therefore the phrase represents light as a ray that travels in a straight line, and its direction changes only if an obstacle intercepts its path
correct phrase
The main characteristics of light:
There are a number of properties that light has, which are as follows
- Refraction is the change in the path of light when it travels from a medium of one substance to a medium of a different substance, and at that time the speed of light is different.
- Interference where light waves that have the same peak and trough can interfere with each other.
- Diffraction and scattering This means that light travels in a straight line, and when it passes through an edge or a small aperture, it is scattered.
- Reflection and scattering When light hits an object, it is reflected and scattered.
- Polarization is that light does not pass through a clear crystal like sunglasses.