Light is a form of energy that travels in waves. It is a type of electromagnetic radiation, which means that it is a disturbance that travels through the electric and magnetic fields of a medium, such as air or water. Light is made up of different colors, each with its own wavelength, or distance between waves. When we see light, we perceive it as a single color, but in reality, it is made up of a spectrum of colors, like a rainbow.
Light travels in straight lines, called rays, until it encounters an object or a medium that changes its path. When light hits an object, it can be reflected, absorbed, or transmitted. Reflection occurs when light bounces off an object, like a mirror. Absorption occurs when light is absorbed by an object, like a black piece of paper. Transmission occurs when light passes through an object, like a window. optics for dummies pdf
Another interesting behavior of light is diffraction, which is the bending of light around an obstacle or through a narrow opening. This is why we can see light bend around the edges of a doorway or through a narrow slit. Light is a form of energy that travels in waves