All Questions
Tagged with refraction reflection
307
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Analysis of the reflection in metal
In order to solve the reflexion in a material with a complex index the solution I've found on textbooks is to define $\hat{n}\cos{\phi}:=a+bi$ where $\hat{n}=n_r+n_ii$ is the complex index and then ...
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2
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Can the colors of white light be separated through reflection alone?
Can the colors of white light be separated through reflection alone? My answer to this is no since if we want to separate the colors, we use prism and when light passes through a prism, the dispersion ...
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295
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Will there be a 'partially reflected ray' at critical angle of incidence?
Will there be a 'partially reflected ray' at critical angle of incidence?
This diagram is given in my textbook. There are 'partially reflected rays' when the 'angle of incidence' is less than '...
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Why does an object become invisible if its index of refraction is equal to the index of refraction of the medium that contains it?
If we suppose that we can change the refractive index of an object to be equal to the refractive index of its surrounding so that it becomes invisible, how can we explain this process?
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Reflection of sound wave passing through gas to solid and through solid to gas
Why following are true in both cases?.
1- Ultrasound passing through a metal block(solid medium) will not pass through a cavity (air medium) inside the block.
I got some explanation as speed of sound ...
- 101
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1
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66
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How are sunglasses only reflective on one side?
Sunglasses can be colored on one side, and dark on the other? Why aren’t both sides either dark or both sides colored. I figured it worked like a one way mirror - but after holding both sides up to ...
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110
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Why does t = $\frac{1}{4}$ for destructive interference by parallel-sided thin films?
I knew for destructive interference for reflected light in thin films: 2t = mλ
Where t is the thickness of the thin film, m is an integer (0,1,2...) and λ is the wavelength of light in the thin film.
...
- 605
1
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1
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215
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How does reflectance change with wavelength? [duplicate]
Sorry if this is an easy question, I am new to physics and this field.
I have a question about reflectance which i believe to be "effectiveness of reflecting radiating energy"
My goal is to ...
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27
votes
1
answer
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White full moon reflected orange-red light off of Atlantic Ocean surface. Why is this?
I was flying over the Atlantic at night in near complete darkness. There was a white, bright full moon. It’s moonglade (the light reflected off the waters surface) was a orange-red color and not white....
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1
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2
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370
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Stokes relations for a glass slab
Stokes relations describes the transmission and reflection coefficients at a boundary between materials of different refractive indices, derived using a time-reversal argument. As far as I understand, ...
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119
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Water trick, explanation needed
So I encountered this video of glass changing colors when placed in water and outside of it.
How is it explained by physics?
Video: Guy puts glass on table where is no water, and the glass appears to ...
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1
vote
3
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387
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How does a rainbow show all of its colours?
My question is tied closely to this one, asked a while back on the website. As far as my understanding goes, a rainbow is formed by sunlight undergoing two refractions and a reflection inside ...
1
vote
1
answer
90
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What is the theoretical range of temperature the air must be in order to reflect/refract light (for a volumetric display)?
Well, the only question I found in this website about volumetric displays on air was this one, but it specifically suggests making air denser in order to make it work, but my question is specifically ...
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4
votes
2
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253
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Rainbow reflections from salt crystals
Especially on a sunny day in the winter or spring, I often notice faint rainbows when I look down at the edge of the road by the curb. I am not sure what causes these rainbows, but I believe that ...
- 233
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635
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What is the smallest value of the incident angle in Bragg's law?
The title of my question basically is what I want to know. In Bragg's law, $nλ = 2 d \sin{\theta}$, if we want to find, let's say, $d$, and know only $\lambda$ and $n$, but not $\theta$, what could be ...
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