Two-source interference · TheLucidSTEM

Interactive Simulator · Interference

Change the slit separation, the wavelength and the screen distance, and watch the fringe pattern respond exactly as λ = ax / D predicts.

Mission Predict the effect on the fringe spacing of moving the screen further away. Streak 0Best 0

Slit separation a 0.5 mm

Screen distance D 2.0 m

Wavelength λ 600 nm

Moving the screen further away makes the fringe spacing:

slit separation a0.5 mm

screen distance D2.0 m

wavelength λ600 nm

fringe spacing x = λD/a2.4 mm

Bright fringes where the path difference is a whole number of wavelengths. Fringe spacing x = λD / a.