A point charge $+q$ , is placed at a distance $d$ from an isolated conducting plane. The field at a point $P$ on the other side of the plane is

When a point charge $+q$ is placed at a distance $d$ from an isolated conducting plane, some negative charge develops on the surface of the plane towards the charge and an equal positive charge develops on opposite side of the plane. Hence, the field at a point $P$ on the other side of the plane is directed perpendicular(as it is a conducting plane) to the plane and away from the plane as shown.