All Questions
7
questions
2
votes
2
answers
75
views
If a weak light source is attached to a string, and someone swing this light source in circle. It seems that this light source is brighter. Yes or no
It may be truly a question of life and death.
You know those glow sticks.
As a sailor it is a good idea to carry one on our lifevest.
Falling into the sea, those glow stick make a light source that ...
8
votes
2
answers
336
views
Why a gravitational lense makes multiple distinct pictures of a distant object rather than making a symmetric ring?
I cannot imagine how a group of galaxies may produce pictures of a distant object on a ring-like region that is not symmetric. Why there are empty parts of that ring where there are no pictures of the ...
- 1,815
2
votes
1
answer
282
views
Do gravitational lenses act as prisms?
Light creates gravity, and the greater the light's frequency, the greater this gravitational effect is. It stands to reason then that light of different colors would react slightly differently to ...
- 804
-3
votes
5
answers
411
views
What causes a single photon to divert its trajectory?
If a single photon passes close enough to a star, the gravity will diverts its trajectory. What causes a photon to divert its trajectory as it passes a sharp edge or the boundary of two mediums?
- 4,083
0
votes
1
answer
104
views
Effects of the sun on Einstein's prediction of gravitational bending of light
From what I understood, $1.75''$ was the predicted value derived by Einstein.
Is it possible that light from the star, at the time of solar eclipse, can also be bent somehow by the solar particles ...
4
votes
2
answers
421
views
Seeing one's back on the event horizon
If we would hypothetically be exactly on the event horizon, we should see our own back, because of the circular motion of photons on the event horizon, right?
But what would be the image size, or $-$ ...
- 991
2
votes
2
answers
563
views
Does gravitational lensing violate Fermat's Principle that light must travel in straight lines?
Does bending of light due to warping of space violate Fermat's Principle or is it that in the principle light goes in a straight line with respect to space (taking space as the reference) and in ...
- 3,905