Science a GoGo's Home Page Forums General Discussion Physics Forum How can gravity slow light?

Light in a vacuum travels at “c”.

Light in a medium appears to travel more slowly, but this is because the photons interact with atoms in the medium (I know that’s an oversimplification). Between atoms, light still travels at “c”.

Light slows in a gravitational field. Unless gravitons are physically real, there is nothing in a gravitational field to take the place of atoms in other media.

What slows light in a gravitational field?

Time for you to think, Spacetime is curving does the light need to slow at all?

Convince yourself first that you aren't seeing a distance or time effect. I am not going to give you an answer here you have to work it thru.

Hmmm a start hint:

https://en.wikipedia.org/wiki/Nautical_mile