There are a number of effects going on here. First two parallel beams fired toward a mass will converge slightly as they are traveling through curved space. But, your ruler thing is backwards. GR predicts the opposite. From an outside observer your rule appears shorter. Additionally, I'm fairly certain the length contraction only applies in the direction of gravitational source.
GR do not address what happens to the ruler, but merely talking about lenght contraction. Note It is reasonable to assume that a given length becomes smaller because the ruler becomes longer.
The only way you can have this to be logical is by considering the following thought experiment
‘A’ live in the basement of a skyscraper, ‘B’ at the top of the same building.
Both have measured the time it took a photon to travel 13 billion. from the very first star and to us..
But A’s clock (deeper in the gravitational field) is as we know ticking slower than B’s clock.
B would argue that it took the photon one minute longer to reach us – than the time A has measured. Simply because B’s clock is ticking faster than A’s clock. The difference is probably in reality less, but it means nothing , its the same point.
We accept that the speed “c” is the same for both A and B.
When both A and B know the time and speed, A and B can only conclude that either the distance to the first star that emitted photon is significantly different, which is utopian, because the universe is not likely to change shape depending on the observer A or B - or anyone else observing that star.
Otherwise, the conclusion can only be that A’s ruler (in the basement) must have changed (
increased its length )
proportional to time also have stretched, measured by A’s clock deeper in the gravitational field.
Only in this way A and B both can assert that ‘c’ is the same for both (even thoug ‘c’ is not comparable the ‘same’..
You are using the word "blueshifted" is a way that I've never heard before.
And this is why the mass brainwashed, - indoctrinated, - illogical, - inconsistent, - incoherent - universe is conflicting with well-established science, - 97% is so-called unknown, - is full of huge self made "mysteries" etc …. etc… etc… - or in short if you prefer, - is build on a naïve intolerant fanatic and almost religious believe that have not much with science or common sense to do..
OK, then answer this question. I have a laser source that emits precisely 500nm, and a detector that can measure wavelength. I place them 1 meter apart to measure the wavelength of the laser. I do this test in deep space, and then also in a gravitational field, such as the surface of the earth. For the earth test, the laser and detector are level (note that the laser must point ever so slightly up to perfectly hit the detector)
Does the detector measure the same frequency in both cases? Does measure above or below 500nm in either case?
If the beam is not affected by gravity, there are no changings ..
If the beam points up or down in a gravitational field, it is also not changing, - rather the rather the environment is changing...one second, as well as 1 nm is now proportional different and therefore you measure different frequency too.