On the question of the principle of light, the principle of light generation

Imaging of small holes. The round spots that you see one by one are actually images of the sun, that is, the image of the sun passing through the small holes in the leaves.

Imaging of small holes. The gaps in the leaves can be seen as small holes, and the spots on the ground are like the sun, because the sun is round, and of course the spots are also round.

Aperture imaging is derived from the linear propagation of light, not diffraction, let alone Poisson bright spots.

The treeshadow flare shape is independent of the light source shape.

Light is produced by the excitation of electrons in the outer shell of an atom! When the outer electrons of an atom are excited, they transition from a low-energy excited state to a high-energy excited state.

In optics, the concept of light can also be extended to the infrared and ultraviolet fields, and even X-rays are considered light, while the spectrum of visible light is only a part of the electromagnetic spectrum.

Light is usually produced by a change in the energy of an electron, specifically when an electron transitions from a high-energy state to a low-energy state, and the lost energy is converted into a photon. The essence of light is electromagnetic waves, which are divided into radio waves, infrared rays, visible light, ultraviolet rays, X-rays, and rays. Radio waves are generally excited by free electrons in a conductor and emitted when the energy decreases.

Infrared, visible, and ultraviolet rays are produced when the valence electrons of atoms are excited to a higher energy level and then transition to a lower energy level. X-rays are produced by the excitation-transition of electrons in the inner shell of atoms. Rays come from inside the nucleus, and in the process of radioactive decay, nuclear fission, fusion, etc., there are often photons when electrons are produced and died.

At the same time, photons are often produced during the collision, decay, and annihilation of positive and negative particles of higher particles, such as the annihilation of electrons and positrons, and a pair of photons are generated. <>

If human vision is not light-sensitive, can we still have the theory of these lights? The answer is clear, that's unthinkable. Both visible and invisible light are the result of cognition based on the subjective interaction of light.

Light is interpreted from the sensory subject itself, which is the perception or reflection of light by the eye.

Light is a type of radiation that can be observed by the human eye. Experiments have proved that light is electromagnetic radiation, and the wavelength range of this part of the electromagnetic wave is about the micron of red light to the micron of violet light. Electromagnetic waves with wavelengths above microns to about 1,000 microns are called "infrared".

Those that are below microns to about microns are called "ultraviolet rays". Infrared and ultraviolet rays cannot cause vision, but the presence of such luminescent objects can be measured and detected with optical instruments or photographic methods. So in optics, the concept of light can also be extended to the infrared and ultraviolet fields, and even X-rays are considered light, while the spectrum of visible light is only a part of the electromagnetic spectrum.

Light has wave-particle duality, that is, light can be regarded as a very high frequency electromagnetic wave (1012 1015 Hz), and light can also be regarded as a particle, that is, light quanta, referred to as photons. The speed of light in a vacuum: c =

There are varying degrees of reduction in propagation in other media.

Popularization of scientific knowledge: the principle of refraction of light.

There is a lot of knowledge about the principle and characteristics of light, and light is composed of photons as elementary particles, which have particle properties and wave properties, which is called wave-particle duality.

Light can travel in transparent substances such as vacuum, air, water, etc.

Light is a series of electromagnetic waves that can be seen by the human eye, also known as the visible spectrum.

In the scientific definition, light refers to the electromagnetic spectrum in a specific band.

There is no clear limit to the range of visible light, and the wavelength of light that the average human eye can accept is between 380 and 760 nm.

Light can be reflected, refracted , diffracted , interfered, and dispersed.

If you are interested, you can continue to ask questions and continue to discuss.