Poetry of light and the physical knowledge contained in it

There is a strong wind in the lunar halo, and the foundation is wet and rainy: when the wind comes, the temperature in the upper air drops rapidly, and the water vapor condenses into small water droplets, which is equivalent to many prisms. The moonlight spreads out through these prisms, forming a colorful halo, so it is called "halo wind". The basic nourishment is the ground against the tide. Before the rainstorm, the air humidity is high, the ground temperature is low, and the water vapor near the ground condenses into small water droplets. In addition, the salt contained in the ground is easy to absorb wet water vapor, so the ground is against the tide, which indicates shanghai dawn.

But you can't see people when you listen to the sound: in the process of wave propagation, when the size of obstacles is less than the wavelength, obvious diffraction can generally occur. The height of the fence is several meters, and the wavelength of sound waves is greater than the height of the fence, so you can surround the high wall and make people outside the wall hear it; The wavelength of light wave is shorter (about 10-6 meters), which is much smaller than the size of a high wall, so the light emitted by people cannot be diffracted outside the wall, and people outside the wall can't see people inside the wall.

One day in the cave has been a Millennium: according to Einstein's theory of relativity, sailing in a spaceship near the speed of light will lead to the passage of time much slower than on earth. If you live in this "cave" for a few days, the earth will spend years, decades or even hundreds of years. Sitting in a well and observing the sky, we can see very little: because light travels along a straight line, according to the knowledge of geometric drawing, the frog's field of vision will be very small. Before the jade is polished, the surface is uneven and the light is diffuse. After the jade is polished, the surface is smooth and the light is mirrored.

Before polishing, the jade surface is uneven and the light is diffuse. After polishing, the jade surface is smooth and the light is specular.

The bright moon is in the sky, and the bright moonlight shines on the calm lake. After reflection, it forms a beautiful reflection in the water, similar to flat mirror imaging. Moonlight enters the human eye through reflection, and only in this way can people see the reflection. People close to the water tower are most likely to receive these lights and enjoy the beautiful scenery of this beautiful night, while people far away from the water can't feast their eyes on them naturally, because the reflected light is blocked by pavilions.

Sunbathing flowers and trees in the sun, the surrounding temperature is high. Plants get more light energy from the sun, so they grow rapidly and have deep roots, and they are the first to know the information of spring. However, back-yang plants absorb less light energy, grow slowly, and the pace of spring comes later.