In the case of electromagnetic waves, cohereent waves are all of the same frequency. White light is incoherent being that the waves are of many different frequncies that come together to make white light. Lasers are coherent, because they are only one frequency.
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... he was ordained on May 24, 1864. On May 10, 1873, at his request, he was permitted to travel to Molokai to help the lepers who had virtually nothing to keep them warm or ...