How much laser pointer can kill a person need to succeed?

　Everyone knows, oh, can not hold a laser pointer shining people's eyes, ah, people might be blind. (In this case, we say, why it is possible, because people will blink, the eyelids can protect the retina). 
　　However, if you are an evil villain, we decided to create "death ray", how much you need a laser to create a deadly weapon? 
　　Well, to clarify this issue, we take a look at what is a laser bar.

　　Straightforward means that the laser is a beam of light, a bunch of photons that are emitted in the same direction. Common light source is a light emitting in all directions. 

　　High energy laser contains a lot of energy, can produce heat, even burning items. For example, the US Navy has a strong laser, capable of burning plane on the sky. 

　　Laser energy is proportional to the mass destruction and its ability to input, usually in milliwatts.In the United States, the Food and Drug Administration requires that all of the following 5 milliwatt laser products, there are some cheap or even less than 1 mW. 

　　However, the laser pointer is not too expensive, you Google it "cheap laser pointer," you can buy a $ 2 less than 5 mW laser equipment. 

　　Laser infrared light is the most dangerous because it is invisible, in front of the retina was burned, the human eye will not blink to protect themselves. Even so, your eyes will be burned, but your people will not be killed. Maybe you need a much stronger than 5 mW laser to achieve this goal.

　　How much do you need a laser pointer it? Or how much laser pointer to kill one person? 

　　American Physical Society Rebecca Thompson said, great. 

　　Rebecca Thompson is a PhD in Physics University of Texas, and in answer to "lethal laser" to this question, she gave us some data. 

　　Want to have reached a deadly laser pointer strength, then it must first hot enough to burn human tissue. About 1KW laser will be able to burn one's eyes to the brain in a certain period of time. Since it will take some time, it means, "The Hitman" can not leave quickly killed the man does not escape the job. 

　　According to the market to sell toys around 5mW laser pointer strength calculations, if the use of such a laser pointer to kill a person, it would need 200 000 is enough. And you also need to bind them in a semi-circle having a diameter of 5.5 inches. In addition, you have to ensure that the forthcoming killed people sat quietly down. 

　　Burn the brain from the eye is the easiest way to murder, however, this method requires you to aim very accurate job. 

　　Well, the answer is this, if you try to use a laser to murder a man, you go to buy 200,000 laser pointer say. 

　　Well, the article finally, to remind you that one, do not just use the laser pointer shining people's eyes, if blind, not a joke, you know, overheat when laser together in photoreceptor cells caused by protein coagulation degeneration irreversible damage.