You're now facing the mirror. Turn right and walk out of the room and turn right again. Take a step ahead and turn left. Now outside and then walk straight till you see three portraits on your left side. From here, turn around and you can find the stairs on your right side. Climb up the stairs till the third step and turn around again. Now get down and take left. Enter inside and walk out of this room from other side. Exit the room and stand in front of the cylindrical equipment, you will reach your destination.