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Gravity effect on light

  1. Nov 10, 2015 #1
    So light has momentum: [itex]\vec p_{light}[/itex]

    If Universal Gravitation tells us: [itex]\vec F = \frac{Gm_1m_2}{r^2}[/itex]

    How do we get the force on light from the more massive object?........ How do we know how much light will be shifted?
  2. jcsd
  3. Nov 10, 2015 #2


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    Gold Member

    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.
  4. Nov 10, 2015 #3
    Okay thanks
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