824.2 Youngs double slit experiment 2. Theoretical analysis Two light oscillations at point P ciden E,r,t) wave =Eo cos(hr-at+o E,(r, t) =Eo cos(hr -at+o) Path length difference r -r=sine eparation of the slits If d>>d 824.2 Youngs double slit experiment Phase difference Ar=-dsinB Path length differenc 4 The condition for constructive interference (bright fringe or maximum) and destructive interference(dark fringe or minimum)on the distant screen is10 2. Theoretical analysis cos( ) ( , ) cos( ) ( , ) 0 2 2 0 1 1 ω φ ω φ = − + = − + E kr t E r t E kr t E r t Path length difference ∆r = r1 −r2 = d sinθ Two light oscillations at point P §24.2 Young’s double slit experiment Separation of the slits If D>>d ∆r The condition for constructive interference (bright fringe or maximum) and destructive interference (dark fringe or minimum)on the distant screen is Phase difference θ λ π ∆ λ π δ sin 2 2 path = r = d §24.2 Young’s double slit experiment