basic

Thin Film Interference Constructive Destructive Calculator

Constructive: 2nt = (m+½)λ; Destructive: 2nt = mλ.

Calculates minimum film thicknesses for constructive and destructive interference in a thin film (n_film > n_air, n_film > n_substrate scenario, one phase reversal).

Priya Venkatesan By Priya Venkatesan
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

t_constructive = λ/(4n_film); t_destructive = λ/(2n_film) for first order

In depth

Calculates minimum film thicknesses for constructive and destructive interference in a thin film (n_film > n_air, n_film > n_substrate scenario, one phase reversal).