Double Slit Interference Calculator

Calculate fringe positions and spacing for Young's double slit interference

Wavelength (nm):

Slit Separation (mm):

Screen Distance (m):

Fringe Order (m):

Formulas Used

Bright fringes (maxima): d sin(θ) = mλ

Dark fringes (minima): d sin(θ) = (m + 1/2)λ

Fringe spacing: Δy = λL/d

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