# Tag Info

Lensing is caused by the ability of a mass to bend light, which angle can be expressed as: $$\theta = \frac{\mu}{rc^2}$$ Where $\mu$ is the gravitational parameter, $r$ the distance to the mass, and $c$ the speed of light. From this, we can find the closest point where light bend around the body into a focus. r_{min} = \frac{r_{body}}{\sin\left(\frac{\...