cse • paper_1 • waves_oscillationscse-1997-subject-02-006
Thin-film interference — UPSC CSE 1997 Physics PYQ
Buy PYQ Solution Manual →Why does a soap film appear coloured when is viewed by reflected white light? A thin film is illuminated by sodium light of wavelength 5900\text{\AA}. Its refractive index is 1.42. Calculate its minimum thickness so that it appears dark in reflected light.
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