AboutKevin Johnson Expertise I will try to answer any question in physics, but I do not provide homework solutions or project ideas. I have some teaching experience at university level but I am also skilled at explaining things in simple terms.
My specialty areas are granular materials, computational physics, particle physics, quantum physics, econophysics and general physics.
Questions in GERMAN are welcome, too.
Experience I have graduated in physics, specialized in theoretical particle physics and quantum field theory, worked in the area of econophysics and am currently working on my PhD in granular materials and computational physics. I have some tutoring and teaching experience at University level.
Education/Credentials German Diploma in Physics (equivalent to M.Sc)
Question QUESTION: This might be a dumb question, but can light ever be used as a surface on-which light can be projected onto, or does light absolutely always travel through other light without effecting it?
ANSWER: Hello James,
Since light has not only particle nature (it consists of photons) but it also has wave nature, it can interfere with light when certain conditions are met: The light must be correlated or coherent, meaning that it comes from the same source or it has (nearly) the same wavelength.
This does not make light like a surface (on which another beam of light can be projected), but it means that one can make light from two directions interfere with one another in such a way that the resulting light (the interference pattern) would hit a detector or the human eye in the same way as if it had originated - or had been "reflected" - at the point or area where the interference takes place.
For more detailed information on interference you might want to visit this page, and perhaps follow some of the links there: http://en.wikipedia.org/wiki/Interference_(wave_propagation)
I hope I could help you a bit.
Peace,
Kevin
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QUESTION: So could someone use laser light fanned out as a kind of surface to project say a movie? For the sake of not requiring a screen everywhere one goes that would be a good thing as well as because I can't very well use clouds since they are set at different distances throughout.
Answer Hello again James,
no, just providing a projection surface for a movie would not work with a "sheet" of light or laser light.
