A cosmic magnifying glass: What is gravitational lensing?

We asked Victor Chan, a Ph.D. student in the University of Toronto's David A. Dunlap Department of Astronomy & Astrophysics, some frequently asked questions about gravitational lensing. Victor Chan is a Ph.D. student in the University of Toronto's David A. Dunlap Department of Astronomy & Astrophysics. He specializes inWhat is gravitational lensing and what causes it?

Gravitational lensing is when light is deflected by objects with very strong gravity. We normally think of light traveling in straight lines. For example, you can see the fire on a candle because its light travels straight to your eyes. Sometimes the path that a light ray takes can be deflected, and we generally refer to this as lensing. We see this happen in everyday life when light travels from one medium into another medium with different density. This is how glasses work.

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