The book didn't talk about the mirror that much so Im really not sure!
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Again, I would take a look at chapter 10. Here Dr. Jekyll explains that he was quite delighted with his reflection in the mirror. He says that he was not "repulsed" rather he "experienced a leap of welcome" at his new image. He was younger and not unattractive. Dr. Jekyll felt he was becoming too old to express his more primal desires. The younger Mr. Hyde could satisfy Dr. Jekyll's nasty side while, so he had thought, absolving him of responsibility.