YDSE path difference (bright fringes) (Δx = nλ (bright))
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Δx = nλ (bright)
What each symbol means
| Symbol | What it stands for |
|---|---|
| n | Order of the bright fringe; integer …, −2, −1, 0, 1, 2, … (constructive interference) |
| λ | Wavelength of light in the medium between slits and screen |
| Δx | Path difference between the two coherent waves arriving at a point on the screen (same units as λ) |
When to use this
Young’s double slit (YDSE); coherent, monochromatic (or narrow-band) sources; same medium for path difference and λ; bright-fringe condition Δx = nλ (plus any extra π phase shifts if a medium flip is specified).