Recent content by Oscar01

I'm not sure what you are trying to say here. So it is by chance that we have only ever seen blue Einstein rings in the visual range? I find that hard to reconcile, especially considering how many we have seen. Infact it is such a common occurrence that there have been papers written...

Yes i mean dispersion.

Infact we don't see different colours at all we only see blue unless redshifted or not in visual range. Unless you can cite a paper that says otherwise. The only one we Have so far agrees with what i Have said above. You could get this phenomena with normal chromatic dispersion. When shining a...

No it isnt. They are seen to be blue in the visual range and given an arbitrary colour if not in visual range. Is this opinion or can you cite. Because the only citation we have says they are always blue unless redhifted or they're in the visual range. If they are not blue then the...

No they are blue unless redshifted. otherwise always blue as is described in this paper that makes an attempt at answering why. http://arrow.dit.ie/engscheleart2/19/ There seems to be no good theory as to why though.

Hi there. Have been doing some informant l independent research on gravitational lensing. It turns out that all einstein runs are blue. Why Is this?

Wouldn't the fact that nearly all Einstein rings are blue be evidence for diffraction? If not what causes this?

Isn't dispersion different between mediums though. For example dispersing light through a prismyields much more intense dispersion than dispersing it through water or air for that matter. Perhaps the image ist high enough resolution to tell? Also the photo above is correcting four Earth's...

That's the problem. I can't find any sources for testing for chromatic abberations at all. Has it been tested for?

So are there experiments confirming no chromatic aberration? I read on another thread that the lensing from the Sun actually does have chromatic abberation.

I understand, but is there a way of telling if the phenomena is caused by the bending of spacetime as opposed to refractional lensing due to matter gradient? How do we know it isn't from refraction?

Hi I am new to the forums. Only undertaken basic physics. Had a thought the other day and wanted to share it. Is lensing of starlight such as einstein rings ever caused by refraction? Could a matter density gradient theoretically cause the same effect? Thanks guys Sorry if its a repost...