Question

Problem 4 A soap bubble of refractive index $n_{soap} = 1.40$ appears yellow when viewed perpendicular to its surface (yellow = white - blue, where $\lambda_{blue} = 440nm$ in a vacuum). A. Does the light change phase when reflected from the outside surface of the bubble? B. Does the light change phase when reflected from the inside surface of the bubble? C. Calculate the wavelength of blue light when passing through the bubble. D. Determine the thickness t of the thinnest bubble for which the blue light reflected from the outside surface of the bubble interferes destructively with light reflected from the inside surface (creating the yellow fringe)

          Problem 4
A soap bubble of refractive index $n_{soap} = 1.40$ appears yellow when viewed perpendicular to its surface
(yellow = white - blue, where $\lambda_{blue} = 440nm$ in a vacuum).
A. Does the light change phase when reflected from the outside surface of the bubble?
B. Does the light change phase when reflected from the inside surface of the bubble?
C. Calculate the wavelength of blue light when passing through the bubble.
D. Determine the thickness t of the thinnest bubble for which the blue light reflected from the
outside surface of the bubble interferes destructively with light reflected from the inside surface
(creating the yellow fringe)

Show more…

$Problem 4 A soap bubble of refractive index nsoap = 1.40 appears yellow when viewed perpendicular to its surface (yellow = white - blue, where λblue = 440nm in a vacuum). A. Does the light change phase when reflected from the outside surface of the bubble? B. Does the light change phase when reflected from the inside surface of the bubble? C. Calculate the wavelength of blue light when passing through the bubble. D. Determine the thickness t of the thinnest bubble for which the blue light reflected from the outside surface of the bubble interferes destructively with light reflected from the inside surface (creating the yellow fringe)$

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University Physics with Modern Physics

Hugh D. Young 14th Edition

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Solved by Expert Dading Chen

05/06/2020

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Therefore, the light changes phase when reflected from the outside surface of the bubble. Show more…

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Problem 4 A soap bubble of refractive index n _soap =1.40 appears yellow when viewed perpendicular to its surface (yellow = white - blue, where lambda blue =440nm in a vacuum). A. Does the light change phase when reflected from the outside surface of the bubble? B. Does the light change phase when reflected from the inside surface of the bubble? C. Calculate the wavelength of blue light when passing through the bubble. D. Determine the thickness t of the thinnest bubble for which the blue light reflected from the outside surface of the bubble interferes destructively with light reflected from the inside surface (creating the yellow fringe) Problem 4 A soap bubble of refractive index n_soap =1.40 appears yellow when viewed perpendicular to its surface (yellow=white-blue,where blue =440nm in a vacuum). A. Does the light change phase when reflected from the outside surface of the bubble? B.Does the light change phase when reflected from the inside surface of the bubble? C. Calculate the wavelength of blue light when passing through the bubble. D.Determine the thickness t of the thinnest bubble for which the blue light reflected from the outside surface of the bubble interferes destructively with light reflected from the inside surface (creating the yellow fringe)

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Transcript

0:00 Take a look at the questions.

00:02 Okay, he said, the soap bubble 2a soap bubble of a refractive index of 1 .4 -0 appears blue, green when viewed perpendicular to its surface.

00:14 So, first question is asking us, does the light change phase when reflected from the outside surface of the bubble? okay? so what it does, why is that? it's because the refractive index of a bubble is greater than a refractive index of a bubble is greater than a refraction.

00:32 Index of air since the light, the red light emitted from the air into the bubbles.

00:38 Okay? so it means the lights come from air to bubble, which means the light is emitted from the median with the lower refracted index into the medium with a higher reflect index.

00:52 Okay? and that's the reason why for the answer for the question a.

00:57 And question b is asking us, that's a light change phase when reflected from the inside surface.

01:08 Well, no.

01:09 Why is that? well remember, when you see those bubbles, it's full of airs.

01:16 So there's only a layer outside of a bubble, kind of like a spherical shape type layers.

01:22 So but inside a layer is full of airs.

01:25 So remember we're talking about this case, which is inside a bubble.

01:31 So the light is from the layer of the bubble, which means the layer of bubble is consists with the reflected index of the bubble.

01:43 Okay? so it means the light comes from a median with a higher reflected index in to a median with a lower reflected index in.

01:54 That means there will be no phase change.

01:58 Okay.

01:59 All right.

02:00 Question c is asking us to determine the wavelengths of rate.

02:03 Red light when passing through the bubble.

02:08 Well, let's take look.

02:09 Well, we know the red light in the air is 670 nanometer...

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