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How can you see the beam from a laser?
Power applied to laser, wavelength & angle of viewing it.
Why cant you see a laser beam if its in pure water?
Because there are no particles large enough to reflect the light back to the viewer.
XmcmxjWhy do you only see laser beams through dust or through cloudy water?
The reason we can only see lasers through dust or cloudy water is because our eye can only see light that enters directly into them. When a laser travels across our plane of vision the laser beam is traveling in a straight line, but when it hits the small particles of dust that light is being reflected in an infinite number of directions. A portion of those reflected light rays enter our eyes resulting in what appears to be a laser beam.
How do you detect a laser beam?
You can see light rays with dust, flour, etc. If you turn on a flashlight, you can drop dust right where the light travels to actually see that beam of light. The same thing happens with red laser beams.
Why cant you see a laser beam as it crosses the room?
If there is dust in the air you can see it as it hits these particles. By the way, you can't see any form of light, laser or otherwise, as it passes through clean air.
How can you see the beam from a laser?
Power applied to laser, wavelength & angle of viewing it.
Why cant you see a laser beam if its in pure water?
Because there are no particles large enough to reflect the light back to the viewer.
Why can you see a light from a laser beam?
If you see the beam, you are seeing the scattered light being reflected off particles in the air. Any light you actually see is no longer laser light, assuming you have sense enough not to look at it directly.
XmcmxjWhy do you only see laser beams through dust or through cloudy water?
The reason we can only see lasers through dust or cloudy water is because our eye can only see light that enters directly into them. When a laser travels across our plane of vision the laser beam is traveling in a straight line, but when it hits the small particles of dust that light is being reflected in an infinite number of directions. A portion of those reflected light rays enter our eyes resulting in what appears to be a laser beam.
How do you detect a laser beam?
You can see light rays with dust, flour, etc. If you turn on a flashlight, you can drop dust right where the light travels to actually see that beam of light. The same thing happens with red laser beams.
How far away would a beam of light have to be to be able to watch it travel?
This would not be possible for a couple of reasons. First let us set up the following scenario. We will shoot a laser from the Earth to the Moon which will take 1.2 seconds to arrive. You will be observing from 240,000 miles away in a spaceship that is at a right angle to the laser beam. This will make the Moon the same apparent size as it is on Earth. In theory, you should see a laser beam begin from Earth and quickly get longer and longer until it reaches the Moon in 1.2 seconds. The problem is that when we see a laser beam, we are not actually seeing the beam itself, only a small part of the beam reflecting off particles in the laser beam's path. Since space is a vacuum, there are no particles for the beam to reflect off, so we see nothing unless the laser beam is pointed directly at us, which in this case is not. The other problem is that when the laser light is reflected toward us from the particles, it is also scattered and would be much too faint to observe from that distance, even with a telescope.
Why can't I see my laser pointer beam anymore?
Dead battery OR very clean air.
Why cant you see a laser beam as it crosses the room?
If there is dust in the air you can see it as it hits these particles. By the way, you can't see any form of light, laser or otherwise, as it passes through clean air.
Why can't we see a laser beam going across the room unless there is fog chalk dust or a mist in the air?
you can, it all depends on the type of laser.
What is the typical power of a green laser pointer in milliwatts?
A standard green laser pointer has a power of between 4 and 20 milliwatts. A red laser, for comparison, has a power of less than 5 milliwatts. The beam of a green laser can often be seen, while the beam of a red laser cannot be seen.
Why wouldn't we see a laser beam coming?
By definition, a laser travels at the speed of light. As soon as one sees it, it has already arrived via visual light.
Name the beam of light used to measure the distance from the earth to the moon?
Lunar Laser Ranging experiment. See related link.
