Thin Film/Coat Interference

Phase Changes, Interference types, and thickness equations of films and coats during Thin Film/Coat Interference for AP Physics 2

Constructive Interference for a Film (Equation)

2t = (m + 0.5)λ

Destructive Interference for a Coat (equation)

2t = (m + 0.5)λ

Constructive Interference for a Coat (equation)

2t = mλ

Destructive Interference for a Film (equation)

2t = mλ

Indices of Refraction for a Film

n1 < n2 > n3

Indices of Refraction for a Coat

n1 < n2 < n3

Phase Change of Reflected Ray

180 degrees

Phase Change of Refracted Ray (Coat)

180 degrees

Phase Change of Refracted Ray (Film)

0 degrees