I have adjusted this yesterday and it did showed me almost the whole blind spot. Now I also understood that why in my Pajero I have so big side view mirrors. By the time car finish 80% appearing on my side view and then I can see the car front from my side eyes means there is good gap of 20% overlap that can help driver almost kill that blind spot if mirrors are adjusted properly.
Great thread Rahim bhai and nice answer Jaan rambo to help everyone drive safely.