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A laser is oscillating at two frequencies v1 and v2 such that v2-v1=c/2l where resonator length. If the laser is used in an interference experiment,what is the minimum path difference between interfering beams for which interference disappears?

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I added the homework tag because this sounds like a textbook homework question. Also, you might want to expand your question a little to tell us what about the concept of interference is confusing you and what you've already figured out on your own. Stackexchange isn't really a place to ask people to compute the answer to a specific problem for you. – Colin K Sep 20 '11 at 19:55
Colin is right - in fact, not just that you might want to expand the question, but you have to in order to bring it on topic for the site. Have a look at this meta question for more information about how to ask homework-type questions here. And if you're confused, feel free to ask for help by commenting here! We're not trying to scare people off, we just want to maintain this site's focus. – David Zaslavsky♦ Sep 20 '11 at 21:01

closed as off topic by Mark Eichenlaub, David Zaslavsky♦ Sep 20 '11 at 20:58

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