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You can only see a beam of light if there are particles around it.
So say there was a man standing under a street light, and the world around
him was foggy, you could then see the beam of light coming from the street
light. And its the same principal with any luminous object.
If there's no particle around, then you can't see the beam of light.
What else can I help you with?
Why cant you see a laser beam as it crosses the room?
You can't see a laser beam crossing a room because the laser produces a narrow, focused beam of light that is not scattered easily. The light particles in the laser beam are not interacting with the air particles in the room, so there are no particles for the light to bounce off of and become visible to the human eye.
Why cant you see a laser beam if its in pure water?
You can't see a laser beam in pure water because the water is transparent, which allows the light to pass through without scattering. This means that the laser beam doesn't interact with the water molecules in a way that makes it visible to the human eye.
Does a beam of light have a beginning and an end point?
yes and no. When you point it at a wall, it ends there. When you point it towards the sky then it doesn't end. You just cant see it go all the way.
What is a material that light can't travel through?
There is no known material that light cannot travel through. However, materials such as lead and thick concrete can significantly attenuate or absorb light, making them almost opaque to visible light.
Why cant you see the laser beam while it is traveling through the air?
Normal (non-coherent) light IS visible in air, just not too noticeably. If something is "visible" then that means specifically that "visible light" (aka light in the visible spectrm) is reaching your eyes. Lasers are only special because instead of being many wavelengths of light, they only emit one wavelength of light. And if that particular wavelength is not in your area then you will see that one more than others. Notice that a laser "tints" the wall red. If you put a red laser on a blue wall then you will see purple dot; etc.. That's why you see the sunset when the sun is no longer in view, the light being scattered by the air and the particles in the air. It's also why the sky is blue, with blue light being scattered by the atmosphere more than the red. But that aside, a low power red laser is not very visible in the air since the longer wavelength of the red light doesn't scatter well off the air molecules. Larger dust or smoke particles in the air can reflect the low power red laser and you see the twinkling effect as the beam hits the individual particles. On the other hand, a the shorter wavelength of a blue-green laser scatters off the air molecules more effectively, so you can see the photons scattering off from the beam. A very high power laser in air is another story. It has sufficient energy to ionize the air within the beam (like a lightning channel) and this ionized air glows with its own emitted light.
Which of the celestial objects can actually shine and how is it that those that can't still appear to shine?
some celestial objects cant shine because some of them do not let light escape.But some actually shine because some of them allow light to escape.
Why cant you see when a flashlight hits your eyes?
because when light is let in your eyes your pupil closes so thus causing temporary blindness
Can the main headlight beam on a 52 fiat punto be adjusted from right to left?
get a set of stick on beam deflectors. these deflect the beam from left to right for European contries. to adjust the light them selves you cant you would have to get a pair of European headlights for that.
What does ambient light mean?
ooh tricky to explain! its the light that isn't coming from the direct light source, but the streetlight say that you cant see the beam of directly, but you are aware of light coming from it as you walk down the street in the dark..
How do you get to the spirit out of the safe on ghost story island?
you cant you have to sail to the light house shine the light right and go to the old jail thats were you find him hes under the safe at the old jail
Why cant you see a laser beam as it crosses the room?
You can't see a laser beam crossing a room because the laser produces a narrow, focused beam of light that is not scattered easily. The light particles in the laser beam are not interacting with the air particles in the room, so there are no particles for the light to bounce off of and become visible to the human eye.
Why cant you see a laser beam if its in pure water?
You can't see a laser beam in pure water because the water is transparent, which allows the light to pass through without scattering. This means that the laser beam doesn't interact with the water molecules in a way that makes it visible to the human eye.
What level does snorunt learn ice beam?
he cant
Why can't i view videos on yahoo shine?
cause. ya cant
How do you craft a plasma beam in minecraft?
you cant without modifying the game
How do you carry a triple balance beam?
simple... if you cant carry it.. then dont (:
Does a beam of light have a beginning and an end point?
yes and no. When you point it at a wall, it ends there. When you point it towards the sky then it doesn't end. You just cant see it go all the way.
