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Electrical Engineering

Two sources of light are said to be coherent if __________. A. they produce waves of the same wave length B. they have the same amplitude of vibration C. they produce waves in the medium simultaneously D. they produce waves of the same amplitude

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Two sources of light are said to be coherent if __________. A. they produce waves of the same wave length
B. they have the same amplitude of vibration  
C. they produce waves in the medium simultaneously
D. they produce waves of the same amplitude
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D. they produce waves of the same amplitude
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