The law of propagation of light (velocity c) changes in curved spacetime.this is forbidden by relativity?

Question

when light moves through curved spacetime,it is bend so that its velocity changes but this voilates the law of relativity that laws of nature should b same 4 all freely moving observers.so how can light b allowed to bend?

to answerer2,
both the things i.e. constant c and bending of light r required by relativity.
velocity is a vector quantity.when light is bending its direction is changing so that its velocity changes.further,light must travel in straight line 4 the magnitude of velocity to b constant otherwise it will change.

answerer3,
wat about the changing direction and thus velocity of light???

Answer 1

Actually Relativity demands that light bends. It states that when any light gets near a planetary body (including a sun) the Gravity Well of the said Solar body will cause the light to curve into the gravity well if it passes within range of it. Because of this, any observer travelling through with this light would of course NOT see light slowing down, but see light travelling at the same speed as themselves. Everything is relative.

Answer 2

Light must follow the geometry of space. Light in a vacuum travels at 300,000,000 meters/second.

Imagine light following a straight-line path in a vacuum from point 'A' to point 'B' and that the trip takes 10 minutes. Next, imagine the same trip now taking 10 minutes and 5 seconds because space is curved between 'A' and 'B' The increased time is due to more distance, not that light has slowed down.

Imagine you're driving from point 'A' to point 'B' at 70 mph and that the trip takes 1 hour. Next, you drive from 'A' to 'B' along a curved route at the same 70 mph. It now takes you 1 hour and 5 minutes to arrive at 'B', but you're speed is the same.

Answer 3

Hi addy

it is the *speed* of light in a vacuum (c) which is constant in relativity, not the velocity. Light can change direction.

Hope this helps!
The Chicken

Answer 4

Light bends when space curves, but its velocity remains unchanged. This is not forbidden by relativity, on the contrary, it is required by relativity.