All Questions
Tagged with refraction dispersion
76
questions
25
votes
3
answers
9k
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Why doesn’t a normal window produce an apparent rainbow?
When light refracts in a prism it creates a rainbow. My question is, why don’t all windows or transparent objects create this dispersion, i.e. why is the refractive index dependent on frequency in a ...
- 969
1
vote
2
answers
1k
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Dispersion through Glass Slab
My questions related Dispersion through Glass Slab:
Why does a parallel surface makes a difference?
Why is that light do get disperse in a prism and a glass slab at surface one but at backs normal ...
user232991
1
vote
2
answers
359
views
What does it mean to say that glass has refractive index 1.5?
The refractive index of a material depends on the wavelength of the light incident upon it which is why dispersion happens. When we say that glass has refractive index 1.5 which wavelength do we have ...
- 11.7k
0
votes
1
answer
104
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Speed of electromagnetic wave [closed]
On dispersion , speed of wave is inversely proportional to its wavelength . Therefore, gamma has max speed. But then in visible light , violet has least wavelength still it has least speed in visible ...
0
votes
0
answers
226
views
How does refractive index increase in anomalous dispersion?
Refractive index generally increases with decrease in wavelength but in anomalous dispersion it decreases with decrease in wavelength. What causes it to be like that?
user167524
8
votes
2
answers
1k
views
What really is the speed of light in a medium/vacuum, group or phase velocity?
While reading about refractive index 2 terms popped up, group velocity which alway slows down in a medium and phase velocity which may exceed speed of light. Say in a complete vacuum and using laser ...
- 13k
2
votes
0
answers
64
views
If the velocity of light is different in different medium is it wavelength changes or frequency changes?
We know that the velocity of light is equal to the product of it's wavelength and frequency. And when light goes from vacuum to any other medium it's velocity changes depending the mediums refractive ...
- 135
3
votes
1
answer
973
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In refraction how does light interact with electrons if it is not absorbed? [duplicate]
What I (think I) understand:
When light is refracted in a medium (say glass), the light interacts with the electrons in the medium and the electrons create new waves. Summing the waves with the ...
- 105
1
vote
1
answer
3k
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Refractive index and wavelength relation [duplicate]
In general, the refractive index of a certain medium tends to decrease with increasing wavelength.
But are there any materials in which the opposite phenomenon occurs? That is, in which the ...
user173119
1
vote
1
answer
121
views
Is there a way to explain a rainbow in an almost-QM-correct way to a 5 year old child?
My toddler asked me "how does rainbow happen", and I would like to give a pedagogical explanation of the relation of photon frequency, its color, and the way different frequencies are bent in a drop ...
- 519
-2
votes
3
answers
2k
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Why do high frequencies have a larger deflection through a prism than smaller frequencies? [duplicate]
The following is a proof that higher (angular) frequencies have a greater deflection than lower frequencies through a glass prism:
It was omitted in the image above, but $n_{\text{air}}$ is taken to ...
- 2,480
1
vote
1
answer
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Why is the speed of light the same for all colors in a vacuum but different depending on the color when light goes through a non-air medium? [duplicate]
I know that red light travels faster in non-air mediums than blue light because of its wavelength, but I'm not understanding why this doesn't happen in a vacuum? This is related to the topic of ...
- 33
11
votes
2
answers
5k
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Why do convex lenses not disperse light like prisms, given that entry and exit points aren't parallel?
I understand that light entering a parallel block of glass at a non-90 degree angle will cause dispersion of colours within the block but that these will be refracted by the same degree upon exit so ...
- 121
0
votes
3
answers
228
views
What is the intensity of photon before and after striking the glass prism?
during dispersion we all know that white light enters in to the prism and disperses into the visible radiation, my question is whether a glass prism can eliminate other wavelengths and allow only ...
3
votes
3
answers
1k
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Order of colors after reflection in a raindrop
I studied two figures of sunlight reflecting in a raindrop:
In the first image, red is shown above violet, but in the second image, red is below violet. Are both cases possible?
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