Wave Optics & Diffraction

Young's Double-Slit Interference& Diffraction Lab

Simulate wave interference patterns in real time. Adjust laser wavelengths, slit separations, and screen distances to compute fringe width $eta$ and diffraction envelopes.

Optical Setup Controls

Laser Wavelength (λ)532 nm

380 nm (Violet)532 nm (Green)650 nm (Red)

Slit Separation (d)0.25 mm

Screen Distance (D)1.2 m

Fringe Width (β)2.55 mm

Angular Spread0.122°

Central maxima intensity is highest. Side fringes diminish according to single-slit diffraction sinc envelopes.

Physical Screen Projection (Interference Pattern)

β = (λ · D) / d = 2.55 mm

Simulated 60 mm observation window on viewing screen at 1.2 m distance.

CBSE Class 12 Wave Optics Derivation

Path difference between waves from slits S1 and S2:

Δx = d · sin(θ) ≈ (d · y) / D

For constructive interference (Bright Fringes): Δx = n·λ where n = 0, ±1, ±2...

For destructive interference (Dark Fringes): Δx = (2n + 1) · (λ / 2)

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