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Why cannot we obtain interference using ...

Why cannot we obtain interference using two independent source of light ?

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The light from an ordinary electric lamp undergoes about 100 million `(10^(8))` random changes every second. Therefore, light from two independent light bulbs, the given set of interference conditions last for only about `10^(-8) second`. As human eye cannot follow such a rapid change, therefore, no interference effects are observed from two independent light bulbs.
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