Oh thank you so much, yeah i think mine has a defective glass. I think what i am seeing is the glass polarization which is distorting the color. I have tried different ones, I tried it with White light and yellow light. They all have the same effect. For the yellow light, it is just dark spots, and not bluish color.
Thank you very much for that example. It really shows that my Nexus 7 is indeed defective!