- TL;DR Summary
- How many time does a galaxy (same size as our milkyway) magnified the background ?
How many time does a galaxy (same size as our milkyway) magnified the background ?
In Hartle's Introduction to General Relativity, he studies the deflection of light for a spherical mass in chapter 9. The estimate is ##1.7## seconds of arc for a light ray grazing the Sun. There would be less deflection for a light ray further from the Sun. In other words, it depends on the mass of the Sun and the impact parameter.OK, how much would light then bend , when passing nearby a milkyway size galaxy ?