Mirror Math

I have a light up mirror. It has a regular mirror on one side and a 10x mirror on the other. I also wear readers. They are very strong readers — 3.0. I can’t see anything smaller than a 25 font without my readers so I wear them on a chain around my neck.

If I have to look at something on my face that is smaller than my nose I have to look at the 10x side of the mirror. When I use the 10x side I don’t wear my glasses because the mirror is doing the work that my classes usually do, but even better.

I have a question about the 10x mirror and my glasses. If I were to wear my glasses and look in the 10x mirror am I seeing everything 30 times greater, that’s 10x multiplied by 3 or am I seeing it 13x greater, that 10x plus three?

Just wondering how magnification works? If you know the answer please message me. Not that I need to see 30x better, but now that I have thought of this question it is driving me crazy to learn the correct answer.

One bit of advice for all my friends with 10x mirrors. It’s fine to use that to find the stray hair you are trying to pluck, but please don’t obsess about wrinkles you are looking at with your 10x mirror. Just remember that no one has 10x eyes. So the things you see in the mirror, no one else can see.