The walls of a soap bubble have about the same index of refraction as that of pl

ID: 1508834 • Letter: T

Question

The walls of a soap bubble have about the same index of refraction as that of plain water, n=1.33. There is air 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 286 nm thick?

B) To what color does this correspond?

C) What wavelength (in air) of visible light is most strongly reflected from a point on a soap bubble where its wall is 341 nm nm thick?

D) To what color does this correspond?

red blue orange green

A) The wavelength of light having constructive interference is the most strongly reflected one.

For constructive interference for soap bubble,

2nsoapd = (n + 0.5)

=> = 2 * 1.33 * 286 / (n + 0.5) = [760.76/(n + 0.5)] nm

For n = 1, = 507.2 nm, which is a part of visible light.

B) Green

C) = 2 * 1.33 * 341 / (n + 0.5) = [907.06/(n + 0.5)] nm

For n = 1, = 604.7 nm, which is a part of visible light.

D) Orange

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