Why don't we have interference when two candles are placed close to each other and the intensity is seen at a distant screen?

Question 1

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?

Question 2

Interference occurs only with coherent sources which have an initial phase difference that does not change with time and have the same frequency. Two candles are not coherent sources hence we do not have an interference pattern.

When the candles are replaced by laser sources they can produce interference pattern provided that they fulfil the conditions of coherent sources.

kratos · Answer 1 · 2021-01-09T22:48:23+0000

Interference occurs only with coherent sources which have an initial phase difference that does not change with time and have the same frequency. Two candles are not coherent sources hence we do not have an interference pattern.

When the candles are replaced by laser sources they can produce interference pattern provided that they fulfil the conditions of coherent sources.

Why don't we have interference when two candles are placed close to each other and the intensity is seen at a distant screen?

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Why don't we have interference when two candles are placed close to each other and the intensity is seen at a distant screen?

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1 Answer

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