# Gravitational lensing - 2 questions

• Dmitry67
In summary, gravitational lensing is a phenomenon where the gravitational field of a massive object bends and magnifies light from objects behind it, resulting in distorted or multiple images. This occurs due to the bending of space-time by the massive object, causing light rays to be bent similar to a lens.
Dmitry67
Observer O sees object S in the imaginary position S', because of the gravitational lensing caused by the heavy mass M.

Question 1.
If O is positively charged and S is negatively charged, in what difrection acts the coloumb force - S or S' ?

Question 2.
If S is massive (but is still much lighter then M) what is a direction of additional grvitational force (well, it is not the force but it is not important here) from S?

In such cases (when there re no repplies) I wonder if I am asking something too smart or too stupid :)

Question 1: The Coulomb force would act in the direction of the negative charge, so it would act towards S.

Question 2: The additional gravitational force from S would also act towards M, in the same direction as the gravitational force from M. This is because the mass of S would also contribute to the overall gravitational field, and the direction of the force is determined by the direction of the field. However, since S is much lighter than M, the gravitational force from S would be much weaker than the force from M.

## 1. What is gravitational lensing?

Gravitational lensing is a phenomenon in which the gravitational field of a massive object, such as a galaxy or a cluster of galaxies, bends and magnifies the light from an object behind it. This can result in a distorted or multiple images of the background object.

## 2. How does gravitational lensing occur?

Gravitational lensing occurs due to the bending of space-time by the massive object. The mass of the object causes a curvature in space-time, which causes light rays passing near the object to be bent. This effect is similar to a lens, hence the name gravitational lensing.

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