Young's double slit fringe width (β = λD/d)
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β = λD/d
What each symbol means
| Symbol | What it stands for |
|---|---|
| D | Distance from slits to screen (m) |
| d | Separation between two coherent slits (m) |
| \beta | Fringe width on screen (m) |
| \lambda | Wavelength in medium between slits and screen (m) |
When to use this
Standard JEE / NCERT assumptions unless stated (paraxial, thin lens, coherent YDSE sources, etc.).