All Questions
17
questions
2
votes
2
answers
134
views
Why can't we see green color in the sky? [duplicate]
From sunrise to sunset we can see a variety of colors in the sky.
For example, during morning the most dominant color is blue whereas during sunset orange,red,yellow and there shades are more dominant....
- 517
1
vote
0
answers
133
views
Refractive index of air for different wavelangthes
When I tried to search about the refractive index of air, I found 1.00029. This is for which wavelength? How can I find refractive index of it for different wavelengthes like red light's wavelength ot ...
2
votes
1
answer
103
views
Tangential rainbows?
My kids just made me aware of a rainbow phenomenon I have never heard of before, happening in the sky up above our heads. I have heard of (and seen) double rainbows before, and I was aware that it's ...
- 121
0
votes
2
answers
87
views
Can we witness Optical illusion in which sun appears to set in mid sea than at horizon?
I was searching for optical illusions and came across a video on youtube where sun seems to set in the mid of sea instead of setting at the horizon? Can anyone please explain how this illusion takes ...
- 1,357
13
votes
2
answers
642
views
Why does sunset spread over the horizon?
Why does sunset light spread horizontally over the horizon, instead of being radially spread around the solar disk?
I understand physics about refraction, and wavelength, and gradient difference ...
- 133
0
votes
1
answer
131
views
Why does the moon sometimes look reddish yellow?
So the question is clear from the title itself.
Only sometimes does the moon when it just rises above the horizon, looks reddish in colour. This mostly as I have seen occurs when the moon rises when ...
- 2,797
1
vote
2
answers
812
views
Why does purple appear in a rainbow?
It is said that people and digital cameras have color sense only for red, green and blue. So when we see violet/purple in a rainbow, whether with our eyes or in a photo, we should be seeing a color ...
- 195
0
votes
1
answer
188
views
What type of mirage is this?
I am very new to the world of mirages and would like some information as to the type of mirage in this picture which I took this morning. It is the cargo ship African Kalmia which passed my location ...
- 39
0
votes
1
answer
56
views
Why do our eyes perceive changes in apparent position of stars as twinkling?
Okay, so we all know that the changes in refractive index leads to continuous changes in star's apparent position but then why don't we see them moving up and down rather than brighten and dim in ...
- 3
2
votes
3
answers
576
views
What is the refraction index in the upper atmosphere (e.g. thermosphere)?
I've been searching for the refraction index in the upper layers of atmosphere such as stratosphere and thermosphere but I can't find it, all that I've seen is all equations without any numbers that I ...
- 415
8
votes
3
answers
652
views
Why do rainbows always appear to be far away from us?
We know that the single rainbow we see is actually a continuous cone of rainbow. If so, why don't we see that cone instead of a single, far-away rainbow?
0
votes
1
answer
236
views
Does a beam of light change direction when it leaves the atmosphere?
Imagine a laser beam shining straight up from the surface of the earth. As the light gains altitude it encounters less and less air and soon no air at all. My question is when it leaves the refractive ...
- 4,711
10
votes
1
answer
8k
views
Can a rainbow be seen from above?
I saw this picture of a "rainbow from above"
Based on what I understand about rainbows, some googling and my experience chasing them, if I saw one and try to fly above it, the phenomenon will ...
- 209
8
votes
1
answer
174
views
Do we have 2 minutes of extra morning?
my physics teacher told me about the refraction and its applications one of them was
2 minutes of early sunrise and after she explained this effect she concluded that days are
2 minutes longer than ...
- 599
2
votes
2
answers
415
views
Penetration of light in the atmosphere
While I was considering an answer to this question, I wondered how much light that enters the atmosphere reaches the ground without colliding with air molecules—if any. I've taken a good bit of ...
- 1,761