All Questions
Tagged with refraction reflection
307
questions
0
votes
1
answer
25
views
Plastic cup filled with water shiny surface [duplicate]
When I hold a plastic transparent cup half filled with water and see it from above then its sides (up to which water is filled )appear shiny. Some of my fingertips (which are holding glass ) are wet ...
- 1
0
votes
0
answers
38
views
It's about the apparent position of anything in case of refraction
So my question is that,what actually the apparent position of let's say a coin in water seen by us is??
It's a small experiment in textbooks that take a coin in a shallow and wider bowl and mark the ...
1
vote
1
answer
113
views
Why is deep open ocean blue?
If we assume the ocean is sufficiently deep so that the blue light transmitted inside the water gets absorbed completely before it reaches the ocean floor and be scattered back towards the surface, ...
2
votes
1
answer
119
views
What is the speed of light in case of Critical Angle?
When light travels from an optically denser to a rarer medium, it bends away from the normal and at a specific angle of incidence, the angle of refraction is ${90}^{\circ}$. When the angle of ...
0
votes
0
answers
60
views
Schlick's approximation for reflectance when $n_1 = n_2$
another raytracer here.
I'm using Schlick's approximation to the Fresnel equations, which is said to be reasonably faithful.
I'm a little puzzled about the situation where the incident ray is just ...
- 101
0
votes
1
answer
39
views
Magnification of closely packed thin lenses, or of closely packed lens and mirror
I was taught how to calculate the equivalent foci in both the cases. And since the formulae resemble the simple mirror and lens maker formulae, teacher said that this system is behaving like a single ...
- 41
0
votes
0
answers
56
views
How to calculate refractive index $n$ from absorbance, transmittance or reflectance spectra? [duplicate]
I have absorbance (Abs), reflectance (R%) and transmittance (T%) data of $\rm TiO_2$ deposited tin film on FTO glass substrate. The data was collected using UV-Vis spectrophotometer.
How to calculate ...
- 11
2
votes
0
answers
85
views
What are the Fresnel formulas for acoustics?
While it's not too difficult to derive Snell's Law for acoustics e.g. from Huygen's principle like for light, I find surprisingly little resources on an equivalent to Fresnel formulas linking the ...
- 6,820
0
votes
0
answers
120
views
How does an Abbe refractometer actually work?
I'm now in the process of writing a report on a lab work i did with an Abbe refractometer.
In all sources i found the working principle of this refractometer is described as such:
"Light shines ...
- 1
10
votes
2
answers
2k
views
Is it possible to witness a rainbow while facing the sun?
We know that a rainbow occurs due to the refraction and reflection of light inside raindrops. We also know that inside spherical raindrops total internal reflection is not possible. So some light is ...
- 123
1
vote
1
answer
56
views
Do mirrors (with metal surfaces) show TIR (Total Internal Reflection)?
[Not a duplicate! Also, the answer to a similar question was unsatisfactory]
I was digging into why we don't use mirrors in place of fibre optics cables. Majorly, the answers were as follows:
It's ...
- 153
4
votes
1
answer
684
views
How do optical fibres work with high critical angles?
The critical angle is given by:
c = arcsin(n2 - n1)
For a typical optical fibre, it says on the web that refractive index (n2) for cladding is higher than that of the glass core (n1) but it's only a ...
- 153
0
votes
0
answers
17
views
Rainbow formation [duplicate]
Please help me with my query regarding rainbow formation.
Many Books gave formation of only red and violet colour whereas middlemost colours are rising doubt.please check the following picture .My ...
0
votes
0
answers
48
views
Phase change in a light wave
Is there a phase change of pi when light is reflected of off a simple plane mirror?
Do we take into account the presence of glass underneath
2
votes
1
answer
124
views
Why rainbow colors are as they are? [duplicate]
There are handful of questions related to rainbow formation here already, but after looking into them, I feel that I must ask yet another one.
I did a little research on the subject, and most of the ...
- 123