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.

Question

Quizplus · Accepted Answer

When the crest of one wave overlaps with the trough of the other wave, they will cancel each other out and result in darkness on the paper. This is because the crest represents the peak of the wave, while the trough represents the lowest point of the wave, and when they overlap, they create a net amplitude of zero, resulting in darkness.

Two Beams of Coherent Light Are Shining on the Same