To eliminate this possibility, your camera offers mirror lockup, which delays the shutter release a little longer than normal so that the picture isn't recorded until after the mirror movement is completed. Of course, you should also mount the camera on a tripod so that camera shake caused by handholding the camera doesn't create blur.
You can take advantage of mirror-lockup shooting only in P, Tv, Av, or M exposure mode. Enable it through Custom Function 10, as shown here.

Mirror-lockup shooting requires a special picture-taking process: Press the shutter button once to lock up the mirror, release the button, and then press it all the way down again to take the picture.