# Gravity effect on light

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1. Nov 10, 2015

### Phys_Boi

So light has momentum: $\vec p_{light}$

If Universal Gravitation tells us: $\vec F = \frac{Gm_1m_2}{r^2}$

How do we get the force on light from the more massive object?........ How do we know how much light will be shifted?

2. Nov 10, 2015

### DaveC426913

Looking up gravitational lensing should give you some of the answers you seek.

We don't talk about the force of gravity - that's Classical Newtonian - we talk about the curvature of spacetime.

3. Nov 10, 2015

Okay thanks