Why would light go to the back of spacecraft in the earth reference frame as shown in figure b? Didn't get that.
If I were on a spaceship moving with speed v, you would see light moving at c, not c+ v. If v were greater than c you would see the light moving backward relative to the rocket because the rocket is faster. (0f course, relativity says it is impossible for an object to move faster than light so this whole scenario is fishy!)
And would do great damage to our karma.Not only that, but rocket observer also has to observe the speed of light to be c, meaning that if it started in front of him moving away, it will stay in front of him and move further away. Try reconciling that with your view of the light falling behind the rocket, and you'll conclude that the scenario isn;t just "fishy", we're talking serious hakarl here.
It wouldn't. That's the point of the picture. It shows that FTL (faster than light) travel is inconsistent with a constant light speed which is one of the pillars of the relativity theory.