Why do the objects outside slowly come down from the bullet train? But it was really fast. Is it glass?

There are misinformation everywhere that EMU is equipped with "deceleration glass", thinking that it can slow down the speed of the scenery outside. In fact, this is a mistake against science. "Deceleration glass" is simply a wrong concept. There is no such thing as "deceleration glass". In fact, both the window glass of the EMU and the front windshield of the car should be called "vehicle safety glass". It is actually a kind of laminated glass, which is made of two layers of tempered glass with a layer of PVB film sandwiched between them. When this kind of glass is damaged by external force, the glass fragments still stick to the film and will not fly out to cause secondary damage to the passengers on the bus. High-quality windshield has good optical performance, good light transmittance and no light distortion. It can truly reflect the shape and movement of the external scenery, and the vision is very clear, just like the visual effect without glass. In addition, the sandwich technology also has certain heat insulation and soft light effect, which makes people feel more comfortable.

Then why is it not fast to see the scenery outside in the EMU? The main reason is that the subgrade of EMU is elevated, generally far away from the scenery, with a wide field of vision. The variable that people judge motion perception is not linear velocity, but angular velocity (viewing angle/second). A point moves at the same speed. If its moving direction is just parallel to the line of sight of the eyes, the viewing angle is 0 (of course, a person has two eyes, so it is impossible for both eyes to be 0, in fact, it can only be close to 0), that is, the angular velocity is 0, and you can hardly feel it moving; When the direction of motion is perpendicular to the line of sight of the eyes, the angular velocity is the largest, and the speed of motion can be felt. In addition, at the same linear speed, the farther the distance, the smaller the angular velocity and the slower the feeling speed. For example, the earth we live in is a celestial body moving at a high speed, and its average revolving linear velocity reaches about 30Km/S! What other car can compare? But can we feel it? I can't. Why not? Is there a "deceleration glass" installed on our earth? Don't! It is because the reference objects we can see (such as the sun) are too far away, and the angular velocity is very small, with an average of less than 1 per day. Such a slow angular velocity, people can hardly tell it apart, thus creating the illusion of "slow"! Next time you take the EMU, look down at the roadbed and telephone poles next to the EMU near the glass window to see if it is still slow.

What kind of "deceleration glass" should be installed on the EMU with a speed of more than 200 kilometers per hour? What if the speed of the plane is more than 800 kilometers per hour and the fighter is as high as several thousand kilometers? What about the space shuttle, which is faster than a fighter plane? So the so-called "deceleration glass" is pseudoscience invented by blind people. Please don't continue this ignorant joke.