Youngs Double Slit Interference Lab - Physics Simulations

t = 0.00s

Laser Source Intensity Fringes

Live Telemetry & Summary

Laser Wavelength (λ) & Color Mapping:
The visualization color changes to match the physical visible light spectrum:
• Violet/Blue (400-480nm): Shortest wavelength. The wave peaks are close together, forcing interference fringes on the screen to pack tightly (smaller fringe width Δy).
• Green (490-550nm): Medium wavelength and fringe spacing.
• Red (600-700nm): Longest wavelength. Wave peaks are far apart, causing the fringes on the screen to spread out widely (larger fringe width Δy).

What does "Simulate" do?
It animates the real-time physical propagation of light wave fronts from the laser source, through the double slits, to the screen. The resulting fringe bands on the screen represent the steady-state, time-averaged intensity distribution.

Fringe Width (Δy):3.792 mm

Slit separation (d):0.25 mm

Wavelength (λ):632 nm

Variable Adjuster

Wavelength (λ)632nm

400700

Slit Separation (d)0.25mm

0.10.5

Distance to Screen (L)1.5m

12.5

Young's Double-Slit Lab

DSLIT

Young's Double-Slit experiment demonstrates the wave nature of light. Coherent light passes through two closely spaced slits, creating two overlapping sources of spherical waves. Their constructive and destructive superposition generates alternating bright and dark bands (fringes) on a screen.

y_m = \frac{m L \lambda}{d}, \quad \Delta y = \frac{L \lambda}{d}

Whiteboard Solver Steps

Step 1

Young's Double-Slit Fringe Spacing

The distance between consecutive bright fringes (fringes spacing) is proportional to screen distance and wavelength, and inversely proportional to slit separation.

\Delta y = \frac{L \lambda}{d}

Step 2

Fringe Spacing Value Calculation

With the current configuration, bright interference fringes will appear separated by approximately 3.792 mm on the viewing screen.

\Delta y = \frac{1.5 \text{ m} \cdot 632 \text{ nm}}{0.25 \text{ mm}} \approx 3.792 \text{ mm}