Double slit interferometer is a middle school optical apparatus, which can be mainly used for determining the wavelength of monochromatic light. The experiment can be performed in an exposed classroom.

Light source: 12V, 200W

Measured wave-length error: ±4%

Double slit separation: d₁=0.200±0.003mm, d₂=0.250±0.003mm

Slit screen distance: L₁=600±2mm, L₂=700±2mm