All Questions
28
questions
2
votes
1
answer
71
views
At which wavelengths do photons behave like X-ray?
Hard X-rays of wavelengths of about an angstrom are very different than regular lights in a way that they can’t be reflected or refracted, which means their refractive index is always close to 1 ...
- 1,455
0
votes
0
answers
26
views
Water vapor: refractive index and extinction coefficient ($n$ and $k$)
Looking for optical properties of water vapor (index of refraction and extinction coefficient) as a function of wavelength.
- 1
1
vote
2
answers
554
views
Does refraction depend on the colour of light?
Consider passing red and yellow lights separately through the same interfaces and with the same angles of incidence.
Light of which colour will be refracted more?
This question was given to me. All I ...
- 119
0
votes
1
answer
51
views
Light in glass/water
When light enters water, the light changes their direction because they only use 75% of their speed in water, because the interactions with the electrons, the wavelength of the photon changes. We SEE ...
3
votes
3
answers
719
views
How to derive this angular shift formula, $\lambda_\theta=\lambda_0\left[1-\frac{\eta^0}{\eta^*}\sin^2\theta\right]^{1/2}$ for interference filters?
I came across this formula from this optical coatings website
$$\lambda_\theta=\lambda_0\left[1-\frac{\eta^0}{\eta^*}\sin^2\theta\right ]^{1/2}\tag{1}$$
Where $\lambda_\theta$ is the peak wavelength ...
- 156
0
votes
1
answer
59
views
Why is refraction of light at a boundary wavelength dependent, and are the two proportional? [duplicate]
Just wondering, why is it that blue light will refract less than red light, i.e. why does the fact that blue light has a shorter wavelength mean that it will refract less at a boundary?
I read ...
- 979
11
votes
5
answers
8k
views
Intuitive explanation for why blue light is refracted more than red light? [duplicate]
I understand the equation explaining angles of refraction related to wavelengths. But I'm looking for a more intuitive approach/visual explanation? Perhaps related to QM?
- 799
0
votes
1
answer
376
views
Why is the two-term form for the Cauchy equation sufficient?
The general Cauchy equation for the relationship between refractive index and wavelength is given by,
$$n = A + \frac{B}{\lambda^{2}}+\frac{C}{\lambda^{4}}+...,$$
but this is often approximated to
$$...
- 1
0
votes
0
answers
54
views
Why frequency does not change when light passes through the denser medium? [duplicate]
as far as I noticed always people in physics have a predefined assumption that frequency is constant. whereas we know that the c is the outcom of product of wavelength and frequency. we have different ...
1
vote
2
answers
1k
views
Dispersion through Glass Slab
My questions related Dispersion through Glass Slab:
Why does a parallel surface makes a difference?
Why is that light do get disperse in a prism and a glass slab at surface one but at backs normal ...
user232991
1
vote
1
answer
258
views
Variation of Refractive index
We know that refractive index, for any medium,
$$n=1/\sqrt{\epsilon\mu}.$$
Also, according to Cauchy's relation
$$n=A+B/\lambda^2,$$
where $A$ and $B$ are constants related to the medium.
...
- 257
0
votes
1
answer
301
views
Photon frequency when transitioning from one medium to another
$E=h\nu$ where $\nu$ is frequency and $h$ is Planck's constant. The frequency, wavelength and speed are related as $c=\lambda\nu$. When transitioning from one medium to another the speed decreases by ...
- 101
1
vote
2
answers
451
views
Contradiction on the behavior of refractive index
The refractive index is given by:
$$ n = \sqrt{\mu_r \epsilon_r} $$
This equation is symmetric about wavelength and is same for all wavelength of light i.e. since $\mu_r$ and $\epsilon_r$ are ...
- 39
0
votes
1
answer
84
views
Why the purple and red light entering the prism is broken at different angles? [duplicate]
Lights entering the prism with different wavelengths at the same angle. why go to different directions? what happens step to step between the protons&electrons in glass and the photons? what is ...
0
votes
2
answers
3k
views
Refractive index variation with wavelength of light
In my book it is written that
$$\text{refractive index} = c/v =\sqrt{\text{permeability} \times \text{permittivity}}$$
The dielectric constant medium is dependent on the frequency of the field. For ...
- 103