Fresnel Reflectance Calculator

Calculate s-pol, p-pol, and average Fresnel reflectance at a dielectric interface. Computes Brewster's angle, critical angle, and multi-surface system transmittance.

Interface Properties

Incident Medium Index (n\u2081)

Transmitting Medium Index (n\u2082)

Angle of Incidence (\u03b8)

System

Number of Surfaces (N)

Reflectance

R_s (s-polarization)

4.219%

R_p (p-polarization)

4.219%

R_avg (unpolarized)

4.219%

Transmittance

T (single surface)

95.781%

T_system (2 surfaces)

91.74%

Special Angles

Brewster\u2019s angle \u03b8_B

56.61°

Critical angle

N/A (n\u2081 \u2264 n\u2082)

Abridged Optics — Fresnel Reflectance Calculator v1.0R = ((n\u2081\u2212n\u2082)/(n\u2081+n\u2082))\u00b2 at normal incidence. T_sys = (1\u2212R_avg)^N. Brewster: \u03b8_B = arctan(n\u2082/n\u2081).