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Question

Why don't we have interference when two candles are placed close to each other and the intensity is seen at a distant screen? What happens if the candles are replaced by laser sources?

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Solution

In case of candles we can't say that the sources are coherrent.

i.e. in same phase, their angular frequencies w can be different which will make a pattern dependent on time and our eyes can't see the pattern formed clearly . The avg intensity becomes 2I because cosθ=0.

And if candles are replaced by light sources, interference happen due to coherrent sources.


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