Two Beams of Coherent Light Are Shining on the Same

question 85

Multiple Choice

Two beams of coherent light are shining on the same piece of white paper.With respect to the crests and troughs of such waves,darkness will occur on the paper where:

• A)the crest from one wave overlaps with the crest from the other.
• B)the crest from one wave overlaps with the trough from the other.
• C)the troughs from both waves overlap.
• D)darkness cannot occur as the two waves are coherent.

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