Simple RAW 3

[Arkhios]

Q408. I cast Dispel Magic on a wizard that has Mirror Image up along with some other buffs. The spell says that every spell 3rd level or lower is dispelled. But how can that be if I instead target a duplicate?

A408. That duplicate is very essential part of a magical effect created by a 2nd level spell. Of course the whole thing is dispelled.

Ps. don't forget to number your questions. And for future, if you have multiple questions in mind, just compile them into one post, instead of polluting the thread with several posts.