All Questions
53
questions
2
votes
0
answers
35
views
Apparent position of object in bowl of water
Say you have a bowl of water and you keep an object in it. What would the apparent position of an object inside the bowl from the position of an outside observer? Will the curvature of the spherical ...
- 187
3
votes
2
answers
3k
views
Why does laser light not bend (refract) when it travels from air to water?
I passed green laser light from air to water but to my suprise the light doesn't bend towards normal even though I changed the angle of incidence.It goes undeflected ,Is it because of its higher ...
- 47
2
votes
1
answer
209
views
Do high powered lasers refract differently than other light?
So I have a question: I am told that there are naval lasers that target over 100's of miles ship-to-ship (not ship to air). Someone asserted that powerful lasers would refract differently than light. ...
- 475
0
votes
1
answer
51
views
How does wetting cotton increase its UV transparency?
Anecdotally, a dry cotton T-shirt prevents sunburn better than a wet one.
This has also been measured (Gambichler et al., "Influence of wetness on the ultraviolet protection factor (UPF) of ...
0
votes
1
answer
42
views
Refraction of light as seen from a glass of water
When we put a straw in a glass of water the size and bending is more when viewd from side than from up. Is this due to the effect of the glass?
0
votes
0
answers
42
views
Swimming lane line shadow
In an indoor pool, I have noticed a distinctive shadow of the swimming lane lines on the bottom of the pool, whereas people swimming there do not leave shadows.
No shadows of the swimmers can be ...
- 61
11
votes
1
answer
847
views
Refractive index of water
The index of refraction is given by the following formula:
$$
n = \sqrt{\frac{\epsilon \mu}{\epsilon_0 \mu_0}} = \sqrt{\epsilon_r \mu_r},$$
where $\epsilon_r$ is the relative permittivity/dielectric ...
- 665
0
votes
1
answer
42
views
When can I see through water at the beach?
I have some oblique photographs of sandy beaches. I have added a contour at a hue of 120° to roughly divide reds (sand) and blues (water/sky).
Source: https://www.stuff.co.nz/travel/destinations/nz/...
- 103
1
vote
3
answers
485
views
Difference between the wave forms in the water and in the Young double slit experiment
We can observe when we cause a slight disturbance at two points on the water surface which is intially totally undisturbed , it will form water waves which would look like as shown in below image:
we ...
- 117
-1
votes
1
answer
205
views
Factors affecting Refractive index
I have a doubt that with increase in temperature the refractive index is decreasing but refractive index of ice is lower than water????
0
votes
0
answers
19
views
Consider 4 cases of water droplet, ie when water droplet is in sea, in glass, in air after rain, as humidity?
When water droplet is in air as water vapours it scatters blue light, after rain by refraction dispersion and TIR it forms rainbow , in sea it scatters blue light while water in glass ( drinking ...
- 159
1
vote
4
answers
1k
views
Why ocean appears blue?
Why ocean appear to be Blue?
I have got two answers
It's surface scatter blue light more
Water absorb red ,yellow, green are absorbed and hence what left is bluish shades.
But ..I got confused, ...
0
votes
1
answer
40
views
Why do things "slowly and gradually and not immediately" get darker when we spill water over them?
See, take a piece of cloth and let some water spill over it. You see, it's not going to get darker immediately but slowly and gradually it does (as more and more water gets absorbed maybe!) Why? I ...
- 97
0
votes
1
answer
95
views
Water wave lens and imaging
Since shallow water can refract water waves, I assume a "sea wave lens" could be constructed by rising sea level.
Could wave sources on the sea surface then be "imaged"? I.e. ...
- 101
34
votes
9
answers
16k
views
Why does water cast a shadow even though it is considered 'transparent'?
If you pour water from a container, the flowing water stream seems to cast a shadow. I am not sure you can call it a shadow, but it definitely is not letting all light through it. How is this possible ...
- 651