Light is a physics term that is essentially a stream of photons in a specific frequency band. A light source emits light because the electrons in the source gain extra energy. If the energy is not enough to make the jump to a more outer orbital, the electron undergoes accelerated motion and releases energy in the form of a wave.
If the leap is followed by just enough energy to fill the empty space in the orbit where it is located, the electron reaches the stable state from the excited state and doesn't move. Otherwise the electron leaps back to its previous orbit again and releases energy in the form of a wave.
There are three laws of propagation of light:
(1) The law of linear propagation of light has been described above. Geodesy is also based on this.
(2) The law of independent propagation of light. When two beams of light meet in the process of propagation, they do not interfere with each other and continue to propagate according to their own paths, and when the two beams of light converge at the same point, the energy of the light at that point is simply summed up.
(3) The law of reflection and refraction of light. When light travels across the interface between two different media, some of it is reflected and some of it is refracted. The reflected light follows the law of reflection and the refracted light follows the law of refraction.
Expanded InformationRelated Concepts of Light:
Light Source
An object that is emitting light is called a light source, and the condition of "being" must be present, and the source of light can be natural or artificial. Physics refers to a certain wavelength range of electromagnetic waves (including visible light and ultraviolet, infrared, X-rays and other invisible light) of the object. Light sources can be divided into three main categories.
The first category is light produced by thermal effects. Sunlight is a good example of this because the surroundings are cooler than the sun, and in order to achieve thermal equilibrium, the sun will keep releasing energy in the form of electromagnetic waves until the surrounding temperature is the same as it is.
The second type of light is atomic leap light. Fluorescent substances coated on the inside of fluorescent light tubes are excited by electromagnetic wave energy to produce light. Also neon lights work on the same principle. Atomic luminescence has its own characteristic spectral lines. Scientists often use this principle to identify elemental species.
The third type of light is produced when charged particles within a substance are accelerated. For example, synchrotron light is emitted when a synchrotron is in operation and carries a powerful energy. In addition, the light blue shimmering light (Cherenkov radiation) emitted by atomic furnaces (nuclear reactors) also belongs to this category.
Baidu Encyclopedia - Light (Duality of Light Waves)