Question: A soap bubble ( ) floating in air has the shape of a spherical shell with a wall thickness of 1 2 0 nm .

A soap bubble () floating in air has the shape of a spherical shell with a
wall thickness of 120 nm.
(a) What is the wavelength of the visible light that is most strongly reflected?
(b) Find the two smallest film thicknesses larger than 120 nm that can produce strongly
reflected light of the same wavelength

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