A friend sent me this picture. What is this blue thing seen over the white tent roof? Just wanted to know how this has emerged. Quite curious to know.
What is this blue thing in this pic?
It is a lens flare...caused by the very bright light in the top right of the image.
Ok, is it caused by the coating on the lens and the colour of the flare depends on it? Here it is bluish in colour.
Thanks Mike for the link. Now it is clear. What I guessed was right but without the correct word 'flare' to refer. Those pictures in the link say it all.