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For K-12 Students · Thin-Film Coating

Thin-Film Coating for a soap-bubble film

Built for k-12 students learning it in middle or high school. Watch the idea come alive with plain-language steps and everyday examples — perfect for projects and homework. Simulate a soap-bubble film live below — adjust the inputs and watch it respond, right in your browser.

Thin-Film / AR CoatingLive

interference kills reflections

Controls

Presets

Film thickness (nm)

Film index n_f

Coat glass with a film a quarter-wavelength thick and its two reflections cancel by destructive interference — an anti-reflection coating. It works best at one wavelength (the reflectance dips to near zero there), giving camera lenses and glasses their faint purple sheen. The same physics makes soap bubbles and oil slicks shimmer with color.

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Data Inspector

Ideal thickness (550nm)100 nm

Min reflectance1.26%

Film index1.38

Governing equation

2 n_{f} t = 2 (1.38) (100) = 276 nm = mλ

Reading this result: At 100 nm the film is almost exactly quarter-wave for 550 nm, so green-light reflection is nearly cancelled — an ideal AR coating.

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Frequently asked questions

Is this good for k-12 students?: Yes — this version of "Thin-Film Coating for a soap-bubble film" is framed for k-12 students learning it in middle or high school. Watch the idea come alive with plain-language steps and everyday examples — perfect for projects and homework.
Do I need to install anything?: No. It runs in any modern browser, free, with no account required.