1. Love at first sight is not possible because it's only a attraction for long lasting Love/relationships EMOTIONAL ATTACHMENT is needed. Love at first sight is based on physical appearance, it is only a attachment not a true Love. If u Love some one, there is no value of PHYSICAL APPEARANCE, only your attachment from the person is counted. Love comes directly from the HEART.
2. Love at first sight is possible when you remain contact with the particular person and try to understand him/her emotionally.