Two coherent sources of light can be obtained by

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A: two different lamps

B: two different lams of same power and same color

C: two different lamps of same power

D: none of these

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Explanation:-

Two sources are said to be coherent if they have exactly the same frequency and have zero or constant phase difference.

Two coherent sources cannot be obtained from two different light sources.

Final answer:-

Hence, the correct option is (D) i.e. none of these.

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