Show all work for a thumbs up$.$ A soap bubble is essentially a thin film of water surrounded by air. Looking at such a bubble you see a streak of color in a $420$ nm thick section of the bubble. Find the wavelength in air of this color. $($The eye can see from $380$ nm to $700$ nm $.$ Hint: Set up the equation the relates path length difference and interference. Try different values of $\text{'}m\text{'}$ until you find one within the visible range.$)$