Answer
The purpose of this question is to get you to think about the distinctions between local and global lighting models rather than to produce a specific predetermined answer. Potential solutions that you might propose include placing appropriately modified copies of the objects to be reflected behind the mirror while considering the mirror transparent or trying to handle images in the mirror as a form of drop shadows.
Work Step by Step
The purpose of this question is to get you to think about the distinctions between local and global lighting models rather than to produce a specific predetermined answer. Potential solutions that you might propose include placing appropriately modified copies of the objects to be reflected behind the mirror while considering the mirror transparent or trying to handle images in the mirror as a form of drop shadows.