What does “Coherence” actually mean in Wave Optics, and why does it matter for JEE?
two sources are coherent if they keep a constant phase difference — a must for a steady interference pattern.
In simple words: two sources are coherent if they keep a constant phase difference — a must for a steady interference pattern. Getting Coherence clear matters because JEE questions on Wave Optics usually test this idea directly, not just a formula you memorised.
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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