Naked Science Forum

Non Life Sciences => Physics, Astronomy & Cosmology => Topic started by: jeffreyH on 23/12/2014 19:07:30

Title: A question on the deflection of light
Post by: jeffreyH on 23/12/2014 19:07:30

Since the speed of light exceeds the escape velocity of most celestial bodies, with the exception of black holes, is there a minimum mass required to cause a noticeable deflection of light. I am asking this in relation to gravitational lensing.

Title: Re: A question on the deflection of light
Post by: syhprum on 23/12/2014 20:58:43

Unless you assume gravity is quantitised there is no minimum mass but the mass of the deflecting body determines the effective focal length which cannot of course exceed the size of the universe.