Could you please explain exactly what the light is used for?

In geometrical optics, light is not seen as an electromagnetic wave, but as a geometric line in the direction of light energy propagation, which is called light.

The straight line that represents the direction of light propagation is called a ray, and light is a geometric abstraction, and it is impossible to get a ray in practice.

Classification of light: infrared, ultraviolet, visible.

Without light, there is no color, and everything in the world would be pitch black. For human beings, light is as indispensable as air, water, and food. The eye is the most important sensory organ of the human body, and the human eye has a strong ability to adapt to light, and the pupil can adjust with the brightness and darkness of the environment.

But if you see things in low light for a long time, your vision will be impaired. Conversely, bright light can cause instantaneous blindness to the human eye or permanent damage. People must work, study and live in the right light environment.

On the other hand, human activities may cause damage to the surrounding light environment, making the original suitable light environment unsuitable, which is light pollution. Light pollution is a special type of pollution, which includes pollution caused by visible light, lasers, infrared rays, and ultraviolet rays. Visible light pollution is more common than glare.

For example, whenever you walk on the side of the road at night, the headlights of oncoming vehicles dazzle pedestrians so much that they can't keep their eyes open, which is a kind of light pollution, called glare.

The modeling effect of light is an important means of revealing the shape, volume, texture and color of the subject. Different forms of light illumination can make the shape, body, quality and color of the subject produce rich changes: side lighting can easily depict the volume of the object; Flat lighting easily depicts the intrinsic colors of the object; Backlighting makes it easy to depict the contours of objects.

Light can also create a three-dimensional effect on a picture with a two-dimensional space. The use of light distribution and chiaroscuro to express the picture space, and the use of atmospheric perspective to express the depth of the picture space are inseparable from the role of light. Through the selection and arrangement of light, the cameraman can also realistically reproduce the concept of time by using light and shadow.

The composition of the photographic picture should be focused, the main and secondary should be clear, and it is easy to do it by using light means. Therefore, light is a powerful means of composing a picture. In a film and television work, the camera can be correct, the color is restored well, the tone is rich, and the external characteristics of different objects are expressed, which is the modeling role of light and the basic task of lighting for photography.

Summary. Hello, define rays: rays are straight lines that represent the path and direction of light propagation. The ideas applied are physical ideas.

Hello, define rays: rays are straight lines that represent the path and direction of light propagation. The ideas applied are physical ideas.

Uses both physical and mathematical ideas. Light is a geometric abstraction, and it is impossible to get a ray of light in the real world.

Light rays are divided into incident rays, reflected rays, and refracted rays.

I hope mine can help you! I wish you a happy life and progress in learning! Happy New Year Make Potato Oaks

In physics, the light tarding line is a straight line with an arrow used to represent the propagation path and direction of light, and it cannot represent the brightness, color, and other properties of light

So the answer is: direction, color