# 弱引力透镜

${\displaystyle \theta ={\frac {4GM}{rc^{2}}}}$

## 参考资料

1. ^ F. W. Dyson, A. S. Eddington, C. Davidson, A determination of the deflection of light by the Sun's gravitational field, from observations made at the total eclipse of 29 May 1919. Philosophical Transactions of the Royal Society. 220A: 291–333, 1920.