Tracing the Light Path of a Green Laser Pointer

In summary, the green color of a laser pointer is more visible due to the higher power and sensitivity to the human eye, as well as the 4th power dependence of Raleigh backscattering on wavelength. This allows the beam to be seen even when there are particles or obstacles in its path.
  • #1
Frannas
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How is it possible to see the light path of a green laser pointer?
 
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  • #2
Your eye is more sensitive to green than, say, red.
Also as the laser beam travels, dust and other particles are in the way. This causes a scattering of the beam, allowing you to see it from behind or from the side or indeed from most any angle.
 
  • #3
Frannas said:
How is it possible to see the light path of a green laser pointer?

Usually reflection off of matter (dust, smoke, water vapor etc), but can be Raleigh backscattering (off of air molecules) if the laser intensity is high enough.

I'm guessing your question is aimed (pardon the pun) at the latter effect. Green lasers will have a light path that is more visible than a red light in clear air for several reasons.

1. The laser power is often higher. (I'm thinking of those high power Argon-ion lasers in light shows)
2. Eyes are >10 times more sensitive to green light than red light.
3. Raleigh backscattering has a 4th power dependence on wavelength resulting in green light reflecting much better than red light by about a factor of 3.
 

What is the purpose of tracing the light path of a green laser pointer?

The purpose of tracing the light path of a green laser pointer is to better understand how light travels and behaves, and to demonstrate the principles of reflection, refraction, and diffraction.

What materials are needed to trace the light path of a green laser pointer?

To trace the light path of a green laser pointer, you will need a green laser pointer, a flat surface such as a table or wall, and various objects to reflect, refract, or diffract the light.

How can one trace the light path of a green laser pointer?

To trace the light path of a green laser pointer, simply turn on the laser and point it at the flat surface. Then, use different objects to manipulate the light and observe how it changes direction and intensity.

What are some common objects that can be used to manipulate the light from a green laser pointer?

Some common objects that can be used are mirrors, lenses, prisms, and diffraction gratings. You can also use household items like glass cups or plastic rulers to see how light is affected by different surfaces.

What can be learned from tracing the light path of a green laser pointer?

Tracing the light path of a green laser pointer can teach us about the properties of light, such as its speed, direction, and how it interacts with different materials. It can also help us understand the principles of optics and how light is used in various technologies.

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