Can the 5 milliwatt laser pointer hurt the eyes?
At present, the degree of harm to people caused by the laser light emitted by the laser pointer is divided into four levels. The output power of the first stage is less than 0.4 milliwatts, the second stage is between 0.4 milliwatts to 1 milliwatt, the third stage is between 1 and 500 milliwatts, and the fourth stage is above 500 milliwatts. Level 2 can temporarily blindness, and level 3 is permanent blindness. Level 4 is not only visible in broad daylight, but can also light a match. According to the laser pointers sold on the market with an intensity of about 5mW, if you want to kill a person with this laser pointer, you need 200,000 sticks, and you need to bundle them into a semicircle with a diameter of 5.5 inches so that it can focus. So powerful. Therefore, "deadly lasers" mostly exist in specific high-tech fields.
Tags
Mains
A 5 milliwatt green Laser pointer (the human eye’s sensitivity to 532 nanometers is much higher than that of 445 nanometers), when illuminated at a space station 400 kilometers away, will become a circular spot with a diameter of about 500 meters to 1 kilometers (according to 1.2mRad milliradians). count). The difficulty of continuously aiming at a space station that is much faster than a bullet, according to JPL engineers, is equivalent to using a laser pointer for 2 minutes to continuously aim at the hair of a pedestrian 10 meters away. Moreover, the light emitted by the 5mw star pen is very weak, and it is basically invisible outdoors. Under the city light conditions, at least 20wm or more of the star pen can be seen by the naked eye. The range is theoretically close to infinity in a vacuum, but due to atmospheric refraction Waiting for the reason is probably about a few kilometers.
2021-09-15 12:37:39
Your Answer: