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14 Nov 2019

Light of wavelength 420 nm is incidentnormally on a film ofwater 1.0 µm thick. The index ofrefraction of water is 1.33.

(a) What is the wavelength of the light inthewater?
nm

(b) How many wavelengths are contained in the distance2t,where t is the thickness of the film? (Do notround youranswer to a whole number.)


(c) What is the phase difference between the wave reflected fromthetop of the air-water interface and the one reflected from thebottomof the water-air interface in the region where the tworeflectedwaves superpose?
rad
I need help with Part (c)

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Nelly Stracke
Nelly StrackeLv2
28 Jul 2019

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Related textbook solutions

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

Related questions

Light of wavelength 584 nm is incident normally on a film of water1.0 µm thick. The index of refraction of water is 1.33.

(a) What is the wavelength of the light in the water (nm)?

(b) How many wavelengths are contained in the distance 2t, where tis the thickness of the film? (Do not round your answer to a wholenumber.)

(c) What is the phase difference between the wave reflected fromthe top of the air-water interface and the one reflected from thebottom of the water-air interface in the region where the tworeflected waves superpose (in radians)?

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?

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