I keep getting “Coherence” questions wrong in Wave Optics. What's the trap?
expecting two ordinary bulbs to interfere.
The usual trap: expecting two ordinary bulbs to interfere. How to avoid it: stable fringes need one source split in two (constant phase). Go back to the definition — two sources are coherent if they keep a constant phase difference — a must for a steady interference pattern.
Key point
Coherence
Common mistake
expecting two ordinary bulbs to interfere.
Memory tip
stable fringes need one source split in two (constant phase).
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