So cool !
I always wondered why the "Einstein's cross", I mean why there are 4 images of the object instead of a ring. After a quick look, it seems that if the lens is perfect (mass distribution) and the alignment as well, it is a ring, and if not, often 4 object due to additional complex effects.
Comments
I always wondered why the "Einstein's cross", I mean why there are 4 images of the object instead of a ring. After a quick look, it seems that if the lens is perfect (mass distribution) and the alignment as well, it is a ring, and if not, often 4 object due to additional complex effects.