Applications of light reflection in real life

1. Specular reflection and diffuse reflection

Specular reflection definition:

Specular reflection means that if the reflective surface is relatively smooth, when parallel incident light rays hit this When facing a reflective surface, it will still be reflected parallel to one direction. This reflection is a specular reflection.

Physical definition:

Specular reflection refers to the reflection of a reflected wave (electromagnetic wave, or sound wave, water wave) in a certain direction; the angle between the direction of the reflected wave and the normal of the reflection plane (Reflection angle) is equal to the angle (incident angle) between the direction of the incident wave and the normal of the reflection plane, and the incident wave, reflected wave, and plane normal are in the same plane.

When taking photos, you should avoid specular reflection light entering the camera lens. Because the specular reflection light is extremely strong, it will form a white bright spot on the photo, which will affect the appearance of the ground objects themselves on the photo.

Specular reflection follows the law of reflection of light.

The nature of the image produced by specular reflection is an upright, equal-sized virtual image located on opposite sides of the object. Specular reflection means that when the incident light is parallel light, it is reflected to the smooth mirror surface and then goes out as parallel light.

Diffuse reflection definition:

It is the phenomenon that light projected on a rough surface is reflected in all directions. When a beam of parallel incident light rays hits a rough surface, the surface will reflect the light in all directions. Therefore, although the incident rays are parallel to each other, because the normal directions of each point are inconsistent, the reflected light rays will be reflected irregularly in different directions. This reflection is called "diffuse reflection" or "diffusion".

This reflected light is called diffuse light. The surface of many objects, such as plants, walls, clothes, etc., may seem smooth at first glance, but if you look closely with a magnifying glass, you will see that the surface is uneven. Therefore, after the originally parallel sunlight is reflected by these surfaces, Shooting diffusely in different directions.

Physical definition:

When a beam of parallel light touches the surface of a smooth object, the light is reflected regularly, and the reflected light rays are also parallel to each other. This regular reflection is called One-way reflection or specular reflection of light. However, the smoothness of an object is relative, and the surface of general objects is rough and uneven. Although the incident rays are parallel rays, the reflected rays are scattered in all directions. This phenomenon is diffuse reflection of light.

Every ray of diffuse reflection obeys the law of reflection.

The parallel beam is no longer a parallel beam after diffuse reflection. The brightness of an object caused by diffuse reflection generally depends on the intensity of the light source and the properties of the reflective surface.

The difference between specular reflection and diffuse reflection

2. Application of specular reflection and diffuse reflection

1. At night after the rain, when you are walking against the moonlight When on a road with standing water, walk on "darker" ground to avoid puddles. This is because light

A. Specular reflection occurs on the ground

B. Diffuse reflection occurs on the ground

C. Diffuse reflection occurs on the water surface

D. No reflection occurs on the water surface

Analysis: What happens when moonlight hits the water surface is specular reflection. When a person walks against the moonlight, almost all of the reflected light from the moonlight enters the person's eyes, so it is seen The place where the water accumulates is "brighter"; what happens on the ground is diffuse reflection, and the reflected light of the moonlight shoots in all directions; less of it hits the human eye, so it is "darker"; so choose B.

Answer: B

Specular reflection and diffuse reflection

2.