Calculate the fringe spacing in Young's double-slit experiment from the slit separation, screen distance, and wavelength of light. Useful for verifying wave optics predictions.
Enter your values below
Wavelength of the coherent light source (e.g. laser).
Distance between the two slits.
Distance from the slits to the observation screen.
How this calculator works
Fringe spacing y equals the product of wavelength lambda and screen distance L divided by slit separation d. This formula holds for small angles where sin(theta) ~ tan(theta).
Common questions about this calculator
These calculators are for educational and informational purposes only. While we strive for accuracy, results should be verified for critical applications. Always consult authoritative sources for engineering or scientific work.
