Part B

When red light is directed normal to the surface of the soap film, the soap film appears black in reflected light. What is thinnest the film can be$?$ Let $0$$0$ be the wavelength of red light in air.

View Available Hint$($s$)$for Part B

$02$$023$$05\mathrm{.}323$$05\mathrm{.}32$$02\mathrm{.}66$$02\mathrm{.}66$$01\mathrm{.}33$$01\mathrm{.}333$$043$$04$

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