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If light waves are coherent, a. they shift over time. b. their intensity is less than that of incoherent light. c. they remain in phase. d. they have less than three different wavelengths.
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If light waves are coherent, a. they shift over time. b. their intensity is less than that of incoherent light. c. they remain in phase. d. they have less than three different wavelengths.

User Swinkaran
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The correct option is: (c) They remain in Phase

Two waves are coherent if the following three conditions are met:
1) They have the same frequency.
2) They have the same waveform.
3) They remain in phase.

Hence the correct option is C.
User Munchkin
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