@@ -1,1 +1,1 @@ - +A common question from pupils is "How far can a laser's pointer travel?". A blue laser of 1W can easily cover up to 450 miles and is useful for presentations. The beam is able to be directed at many different directions, and even towards vehicles moving. But a high-power laser could extend its beam to the point that it would be unable to be seen from a vehicle. In these instances it is possible for a more powerful laser to be used.<br><br>The power of the laser beam from the pointer can vary. A laser with a power of 200mW can be observed from one mile. A red laser of 1000mW can be seen from 10 miles away. Certain lasers have a shorter distance. According to ScienceDaily.com, the world's longest [http://32.jerudaica.org/blog/index.php?entryid=497780 cross laser pointer] measures 270 kilometers. It's worth noting that a projectile or a 'laser' in space will continue to emit light until it strikes something. The green laser however will only display a tiny area across a room.<br><br>If you're worried about security, you may consider the laser pointer that is green. It's as bright 100-watt light bulbs at three feet, but it's as bright as a quarter moon when looking up from the distance of 40,000 feet. Laser pointers that are green, however, is not safe to use. You should always buy an established brand. If you're unsure then read the reviews and ask friends and family whether they've experienced any issues using these devices.<br><br>While laser pointers are able to travel for a long distance however, their range is very limited. This is because they can be too powerful for the distance they be able to cover. You'll want to keep the laser in a closed housing to avoid spills that could happen. And while you're there, be sure to look over the distance of the laser. It's a great way to ensure safety and avoid a dangerous situation!<br><br>There are a variety of methods to calculate the distance a laser can travel. The distance to the moon is 238 miles, and it's possible to locate one that's powered by 500mW. You can use a 50mW laser and it'll be able to work as far as it's designed to. Using a 5mW laser pointer could be risky and also distracting.<br><br>Laser pointers are designed to operate at a low power level. If you own a laser that is just a few thousand milliwatts in power that you can see for up to a mile. If you're on an airplane, it could be impossible to see the laser pointer , unless it's directed at your eyes. If you're in the remotest part of the world the beam of light from the laser pointer can be seen from miles away.