What does “Path difference & fringes” actually mean in Wave Optics, and why does it matter for NEET?
bright fringes form where the path difference is a whole number of wavelengths, dark where it's an odd number of half-wavelengths.
In simple words: bright fringes form where the path difference is a whole number of wavelengths, dark where it's an odd number of half-wavelengths. Getting Path difference & fringes clear matters because NEET questions on Wave Optics usually test this idea directly, not just a formula you memorised.
Key point
Path difference & fringes
Common mistake
mixing up the conditions for bright and dark fringes.
Memory tip
path diff = nλ → bright; (n+½)λ → dark.
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