What is the principle of light? Principles and applications of light and action

The principle of photosynthesis is to rely on other ways to take in nutrients, and plants are a type of so-called autotrophs. For green plants, during sunny daylight (when the light intensity is too strong, the stomata of the plants will close, resulting in a decrease in photosynthesis intensity), they use the sun's light energy to photosynthesize to obtain the nutrients necessary for growth and development.

Green plants use light energy to assimilate the carbon dioxide and water they absorb into organic matter. The light reaction can only be carried out under light conditions, while the carbon reaction can be carried out as long as the carbon reaction conditions are met. That is, the carbon reaction does not have to be carried out in dark conditions.

The study of photosynthesis plays a fundamental guiding role in agricultural production, environmental protection and other fields. Knowing the influencing factors of light reaction and dark reaction can take advantage of the advantages and avoid the disadvantages, such as building greenhouses to speed up air circulation to increase crop yields. It is also known that ribulose bisphosphate carboxylase catalyzes both photosynthesis and photorespiration, and attempts are being made to modify it to reduce the latter, avoid the consumption of organic matter and energy, and increase crop yields.

The purpose of agricultural production is to obtain higher yields with fewer inputs. According to the principle of photosynthesis, changing certain conditions of photosynthesis and increasing the intensity of photosynthesis (referring to the amount of sugar produced by plants through photosynthesis per unit of time) are the main measures to increase crop yields. These conditions mainly refer to light intensity, temperature, CO2 concentration, etc.

How to regulate environmental factors to maximize the intensity of photosynthesis is a major issue in modern agriculture.

Examples of agricultural applications include: reasonable dense planting, three-dimensional planting, appropriate increase of carbon dioxide concentration, appropriate extension of light time, reduction of atmospheric electric field shielding, establishment of space electric field, etc.

The propagation principle of light: light propagates in a straight line in the same homogeneous medium, which is usually referred to as the straight propagation of light. It is an important foundation of geometrical optics with which imaging problems can be solved concisely.

The human eye determines the position of an object or image based on the linear propagation of light, which is a part of physical optics.

The law of light propagation:

1. Light propagates in a straight line in a homogeneous medium. For example, the small hole imaging, the eclipse and the formation of a lunar eclipse.

2. The independent propagation law of lightTwo beams of light do not interfere with each other when they meet in the propagation process, and continue to propagate according to their respective paths, when the two beams of light converge at the same point, the light energy at the point is simply added.

3. The law of reflection and refraction of light. When light travels through the interface of two different media, part of it is reflected and part of it is refracted. Reflected rays follow the law of reflection, and refracted rays follow the law of refraction.

The premise for light to propagate in a straight line is in the same homogeneous medium.

The principle of light propagation in a straight line, the fierce bay step must be ah yes Ding line

The scattering of light, reflected in all directions (everywhere) equals diffuse reflection.

Light has particle and wave properties, in short, light has wave-particle biartality, it propagates like a wave, and propagates like a particle, and the propagation speed of light in a vacuum is 299792458 meters and seconds.

Light is a type of radiation that can be observed by human eyes. Yumi zhi

It is verified that the bright light is the electromagnetic radiation DAO, and the echo wavelength 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.

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.

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Physical Optics: Studying optics from a microscopic perspective, wave-particle two Zheng collapse theory; Emission, reflection, refraction, refraction, diffraction, photoelectric effect, laser...

Geometric positive optics: the study of optics from a macroscopic perspective, based on the linear propagation of light, etc., mainly the study of optical paths, such as lenses, telescopes, microscopes, collimators...

Light exhibits particle characteristics in short waves (ultraviolet), and in long waves, the wave is prominent.