So.... is it correct to think that every law of physics has an associated equation?
Both are true. That is not specific for SR, but also true in classical mechanics from Newton/Galilei:Question: is the path followed by the light pulse straight or zig-zag? Which one is physically true? Both, even if they are different in length and shape?
A philosopher might say "No", but most useful expressions of laws involve numbers and equations that I can imagine.So.... is it correct to think that every law of physics has an associated equation?
The light rays do not bend. In special relativity, every "ray of light" (by which I assume that you mean "trajectory of a light pulse") is straight in every inertial frame. It is not clear what verb should be used to speak of the difference between the coordinate-velocity of the same ray of light in two different frames, but "bend" is not it.if a light source approaches an observer, the perceived light is stronger for two reasons: because the source is getting closer and also because the light rays change direction and bend toward the direction of motion, correct?
Note that you don't have to look at special relativity to address this issue. Imagine you are in a commercial airliner cruising at a steady speed of, say, 600 mi/h. As you sit in your seat you toss a ball upward, and it comes back down to land in your hand. The ball's path is straight.Summary: The path of a light pulse moving bouncing between two mirrors (top and bottom) from two different inertial frames.
Question: is the path followed by the light pulse straight or zig-zag? Which one is physically true? Both, even if they are different in length and shape?
The fact that they are massless--they have zero invariant mass. Anything with zero invariant mass must move at the same invariant velocity in all reference frames. That's one of the basic facts of relativity.What makes photons so special, they have a fixed, absolute value of velocity?