In the end how many laser pen to be successful in the formation of deadly weapons?

Everyone knows, oops, can not hold the laser pen according to the eyes of others ah, people may be blind. (Here, we have to say why it is possible, because people will blink, eyelids can protect the retina). But if you are an evil villain, decide to make "death rays" and how much laser do you need to create a deadly weapon?

Well, to figure out the problem, let's take a look at what is the laser.

Simple and straightforward is that the laser is a beam of light, that a beam of photons are moving in the same direction. Ordinary light source is shining in all directions.

High energy lasers contain this large amount of energy that can produce heat and even burn items. For example, the US Navy has a strong laser, can burn a plane on the sky.

The lethality of the laser is proportional to the energy it can enter, usually in milliwatts. In the United States, the Food and Drug Administration requires all laser products to be below 5 mW, with some even less than 1 mW.

However, the laser pen is not too expensive, you Google about cheap red laser pen, you can use less than 2 dollars to buy a 5 mW laser equipment.

The infrared light of the laser is the most dangerous, because it is invisible, before the retina is burned out, the human eye will not be blinking for self-protection. Even so, your eyes will be burned out, but your people will not be killed. Maybe you need more than 5 milliwatts of laser to achieve this goal.

How much laser pen do you need? Or how much of the laser pen to kill a person?

Rebecca Thompson of the American Physical Society said it was great.

Rebecca Thompson, a Ph.D. in physics at the University of Texas, gave us some data when answering the question of "deadly laser".

A laser pen wants to have to achieve a fatal intensity, then it should first be hot enough to burn human tissue. About 1KW of laser can be in a certain period of time to burn a person's eyes to the brain. Since it takes a certain amount of time, it means that the "killer" can not leave quickly, and the man who is killed will not run away.

According to the market to sell the toy laser pen intensity is about 5mW calculation, if you want to use this laser pen to kill a person, it needs 200,000 is enough. And you also need to bundle a semicircle with a diameter of 5.5 inches. In addition, you have to ensure that the person who is about to die will sit quietly.

Burning the brain from the eyes is the easiest way to murder, but this method requires you to aim at the line.
Well, the answer is that, if you try to use a laser to murder a person, you go to buy 200,000 laser pen to say.
Well, the article finally, and then remind you one, do not just use the laser pointer according to the eyes of others, if blind, is not a joke, you know, the laser gathered in the light cells caused by overheating caused by protein coagulation degeneration is Irreversible damage.