Determination of the thickness of paper by obtaining fringes in wedge shaped air film.

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Determining the refractive index, absolute thickness and local slope of a thin transparent film using multi-wavelength and multi-incident-angle interference

optics - Which are the rays that form the fringes in wedge shaped film and Newton's rings? - Physics Stack Exchange

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Micron-Scale Wedge Thin Films Deposition Made Simple - Advanced Science News

3.E: Interference (Exercises) - Physics LibreTexts

A wedge-shaped film of air is produced by placing a fine wire of diame

Removal of Etalon Features in the Far-Infrared–Terahertz Transmittance Spectra of Thin Polymer Films - Ulrich Schade, Dawei Cao, Ljiljana Puskar, Eglof Ritter, Jörg Beckmann, 2020

Determining the refractive index, absolute thickness and local slope of a thin transparent film using multi-wavelength and multi-incident-angle interference