Chapter 26, Problem 14P

The walls of a soap bubble have about the same index of refraction as that of plain water, n = 1.33. There is a both inside and outside the bubble. (a) What wavelength (in air) of visible light is most strongly reflected from a point on a soap bubble where its wall is 290 nm thick? To what color does this correspond (see Figure 23.3)? (b) Repeat part (a) for a wall thickness of 340 nm.