This scene is from the The Conjuring where Lorraine (Vera Farmiga) has just fallen into the basement and uses the mirror in the music box to search for any ghosts that might be with her.
In the scene, the basement is completely dark with the exception of Lorraine's flashlight. This is a medium close up on her face as she looks in the mirror. The use of darkness around her is used to heighten the feeling that she is alone in the basement before the director chooses to reveal anything else.
This next screenshot is a close up on the reflection in the mirror. It is a little out of focus to give them that supernatural feel. The lighting is intentionally only on the two actors as they are the main focus of the shot.
The next shot is Lorraine turning to look back in the mirror and she sees that the ghosts are gone. The music suddenly stops. She turns back to look and the ghosts not behind her. This is to trick the audience into thinking things are now safe. When she turns back and puts the music box down, the ghost woman appears inches away from her face. It then cuts to an extreme close up of Lorraine's face, one that mirrors the close up of the ghost. She turns around and lowers the music box, then we see the face of the ghost that was behind her. The music blares. Half of the ghost woman's face is hidden in shadow from the use of low-key lighting. The same was used for Lorraine's face.