In this image I have edited the reflection in the mirror to be un-blurred it is in focus and is the center point/focus of the image.

To create this effect you;

Open Photoshop – Duplicate Layer – Mask Layer – Filter – Blur – Motion Blur – Then selected how blurred you want the image to be – Selected the Eraser tool  – Erase the section that you want to be in focus – Than you have the final image.