A soap bubble with walls 420 nm thick floats in air.
A) If this bubble is illuminated perpendicularly with
sunlight, what wavelength of visible light will be absent in the
reflected light? Assume that the index of refraction of the soap
film is 1.33. [λ = ____nm]
B) What color will be absent in the reflected light? [ red,
orange, yellow, green, blue, violet ]