So I was taking a photo of the reflection of an exit sign. The sign was about 20ft away. I was shooting the screen of a phone which was about 1 foot away. In order for the sign in the reflection to be in focus, I had to set the focus to about 20ft even though the reflection I was shooting a phone screen that was a foot away. The phone and table it was sitting on were very out of focus including the screen, but the reflection of the sign was crystal clear. Why?
In: Physics
Think about taking a photo through a window. You don’t focus on the window glass; you focus on the things beyond the window. A mirror is essentially the same thing except it bounces the light. You’re essentially looking “through” a mirror to an image that’s “behind” it, and you this have to focus your camera on the distance “behind.”
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