Incident Ray (A)
Reflected Ray 1
Refracted Ray (B)
Reflected Ray 2 (C)
Transmitted Ray (D)
Normal Lines
Interference Fringes
Intensity vs Thickness
Film Thickness
200 nm
Refractive Index
1.33
Incident Angle
30°
Wavelength Selection
530 nm
Interference Result: ◑ Intermediate
θ₂ (refraction)22.08°
Path Diff (Δ)490.7 nm
λ selected530 nm
m value (Δ/λ)0.926
θ_critical48.8°
θ_Brewster53.1°
⚡ Phase Shift Note: Ray 1 reflects from a denser medium (air → film, n₂ > n₁), incurring a π (180°) phase shift. Ray 2 reflects from a less dense medium (film → air) — no shift. Net effect: constructive condition becomes Δ = (m + ½)λ.