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A soap bubble is essentially a thin film of water surrounded by air. The colors you see in soap bubbles are produced by interference. 

(a) What visible wavelengths of light are strongly reflected from a 390 nm -thick soap bubble? 

(b) What color would a 390 nm thick soap bubble appear to be (green, purple, or yellow)?

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31 Oct 2020
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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

1a.
Two slits are 0.158 mm apart. A mixture of red light (wavelength=665 nm) and yellow-green light (wavelength = 565 nm) falls ontheslits. A flat observation screen is located 2.24 m away. Whatisthe distance on the screen between the third-order red fringeandthird-order yellow-green fringe?

1b.
a) What, if any, phase change occurs when light, traveling inair,reflects from the interface between the air and a soap film (n=1.33)?
b) What, if any, phase change occurs when light, traveling in asoapfilm, reflects from the interface between the soap film and aglassplate (n = 1.52)?
c) Is the wavelength of the light in a soap film greaterthan,smaller than, or equal to the wavelength in a vacuum?
d) A soap film (n = 1.33) is 465 nm thick and lies on a glassplate(n = 1.52). Sunlight, whose wavelengths (in vacuum) extendfrom 380to 750 nm, travels through the air and strikes thefilmperpendicularly. For which wavelength(s) in this rangedoesdestructive interference cause the film to look dark inreflectedlight?

1a.
Two slits are 0.158 mm apart. A mixture of red light (wavelength=665 nm) and yellow-green light (wavelength = 565 nm) falls ontheslits. A flat observation screen is located 2.24 m away. Whatisthe distance on the screen between the third-order red fringeandthird-order yellow-green fringe?

1b.
a) What, if any, phase change occurs when light, traveling inair,reflects from the interface between the air and a soap film (n=1.33)?
b) What, if any, phase change occurs when light, traveling in asoapfilm, reflects from the interface between the soap film and aglassplate (n = 1.52)?
c) Is the wavelength of the light in a soap film greaterthan,smaller than, or equal to the wavelength in a vacuum?
d) A soap film (n = 1.33) is 465 nm thick and lies on a glassplate(n = 1.52). Sunlight, whose wavelengths (in vacuum) extendfrom 380to 750 nm, travels through the air and strikes thefilmperpendicularly. For which wavelength(s) in this rangedoesdestructive interference cause the film to look dark inreflectedlight?

In a biology lab, a thin wedge of air is formed by putting a humanhair between two plates of glass at one end, allowing them to touchat the other end. The plates of glass are 3.5 cm wide and have anindex of refraction of n= 1.5. When these plates are illimuniatedfrom above with visible light of wavelength ? = 771 nm, it isobserved that 179 bright fringes are formed from one end of theplate to the other.
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a) How thick is the hair?
thair= µm


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b) The two plates of glass are now replaced with two small platesof plastic with the same dimensions, except now n= 1.4 for theplates. How thick would the hair have to be so that you would seethe same number of bright fringes as before?
thair= µm


--------------------------------------------------------------------------------
c) The plastic plates remain in place, but now the wedge if filledwith water (n=1.3) How thick would the hair have to be so that youwould see the same number of bright fringes as before?
thair= µm

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