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Consequently, a gravitational lens has no single focal point, but a focal line. The term "lens" in the context of gravitational light deflection was first used by O. J. Lodge, who remarked that it is "not permissible to say that the solar gravitational field acts like a lens, for it has no focal length". [11]
Angles involved in a thin gravitational lens system. As shown in the diagram on the right, the difference between the unlensed angular position β → {\displaystyle {\vec {\beta }}} and the observed position θ → {\displaystyle {\vec {\theta }}} is this deflection angle, reduced by a ratio of distances, described as the lens equation
Gravitational lensing is an effect of gravitation, most commonly associated with General relativity Wikimedia Commons has media related to Gravitational lensing . Subcategories
Huchra's lens is the lensing galaxy of the Einstein Cross (Quasar 2237+30); it is also called ZW 2237+030 or QSO 2237+0305 G.It exhibits the phenomenon of gravitational lensing that was postulated by Albert Einstein when he realized that gravity would be able to bend light and thus could have lens-like effects.
Strong gravitational lensing is a gravitational lensing effect that is strong enough to produce multiple images, arcs, or Einstein rings. Generally, for strong lensing to occur, the projected lens mass density must be greater than the critical density, that is . For point-like background sources, there will be multiple images; for extended ...
Relativistic images are images of gravitational lensing which result due to light deflections by angles ^ > /. This term was coined by Virbhadra and Ellis [ 1 ] in the year 2000 and is used by many researchers working in this field [ 2 ] (see also in [a] , [b] , and [c] .)
The key difference between an embedded lens and a traditional lens is that the mass of a standard lens contributes to the mean of the cosmological density, whereas that of an embedded lens does not. Consequently, the gravitational potential of an embedded lens has a finite range, i.e., there is no lensing effect outside of the void.
An Einstein Ring is a special case of gravitational lensing, caused by the exact alignment of the source, lens, and observer. This results in symmetry around the lens, causing a ring-like structure. [2] The geometry of a complete Einstein ring, as caused by a gravitational lens. The size of an Einstein ring is given by the Einstein radius.