A certain region of a soap bubble reflects red light of vacuum wavelength

PHYSICS · Single correct · AP · Physics 2: Algebra-based · Waves Sound and Physical Optics · Waves Sound and Physical Optics

Problem

\lambda=650\,\text{nm}

. What is the minimum thickness that this region of the soap bubble could have? Take the refractive index of the soap film to be

1.41

. (1)

1.2\times10^{-7}\,\text{m}

(2)

650\times10^{-9}\,\text{m}

(3)

120\times10^7\,\text{m}

(4)

650\times10^5\,\text{m}