How do I create a wall of green lasers?

How do I create a wall of green lasers?
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You might get some ideas from this image search
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Description : Why are high wattage class 4 lasers so much more expensive than lower wattage lasers?

Last Answer : I’m guessing it’s got to do with the research and development it takes to build the more expensive laser. They need to make their money back. Also they may make less of them so they’re more expensive to build. And lastly, they charge what the market will bear.

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Description : How do lasers react with water?

Last Answer : The light will refract due to the change in density between the air and water, just like any other light. The difference in the speed that light travels in the medium is the cause of the angle change. http://en.wikipedia.org/wiki/Snell's_law

I have heard about the efficiency of laser cleaning but I'm worried about the safety of my staff. How safe is it to use lasers in industrial cleaning?

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Description : Lasers used in medicine include: a. argon b. carbon dioxide c. helium d. all above

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Description : Which property of lasers enables the medicals practitioners to use them for performing cataract operations? Explain.

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