alleryWhen two sources are incoherent, their intensities:
AJust add up
BCancel out
CStay at zero
DDouble each
Answer & Solution
Correct answer: A. Just add up
1. The phase difference varies at random over time.
2. The interference term averages away to nothing.
3. So the intensities simply add up.
_Source: syllabus Physics Part II, Chapter 10, Wave Optics._
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