Class 12 Physics simulations · Wave Optics

Double slit interference

Pass light through two slits and watch bright and dark fringes form.

Open the simulation

What to notice

Bright fringes occur where waves from the two slits arrive in phase.

Key relation

β = λD / d

Try this

Increase the slit spacing. How does fringe spacing respond?

What you can change

• Light wavelength: 400 to 700 nm
• Slit separation: 0.2 to 1 mm
• Screen distance: 1 to 3 m

More in Wave Optics

• Brewster’s angle
• Single slit diffraction
• Diffraction grating orders
• Fringe width in Young’s experiment
• Polarisation and Malus’s law
• Resolving two stars (Rayleigh criterion)
• Thin-film interference

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