Is that windows 8 running on your air?
It's normal, because the air's screen build quality isn't that great that you should see these V shapes emitted from the led backlighting. However, it seems a little too pronounced. If the problem persists, you should bring it in to an Apple store just to make sure everything is ok...
Yes sir, this is Windows 8
So far opinions are different. Some posts said this is unacceptable, some that it's normal thing.
https://forums.macrumors.com/showthread.php?p=15271557#post15271557
For example this guy had always this problem...
I noticed it on a white background in Windows(and on Apple loading screen on bootup). On black screen everything's fine, only on bright backgrounds like white, grey, light red, green, etc. I'm not surfing in Safari on fullscreen, in that place with glow I have dock, so I don't see it. Nonetheless, it's kinda distracting, but maybe I'm queasy...
The problem is I have hundreds of kilometers to nearest Apple Store. And I will be in my house in january, so far I will need macbook for studying/work...