(1) The incident point is perpendicular to the normal of the plane mirror, and then the first reflected ray is made according to the fact that the reflection angle is equal to the incident angle.

Make the normal of the second mirror, and then make the second reflected light according to the reflection angle equal to the incident angle.

(2) The balloon is subjected to four forces: the point of action is at the center of gravity, the direction of gravity G is vertically downward, the direction of buoyancy F is vertically upward, the direction of wind force F 1 is left, and the direction of rope tension F2 is downward along the rope, as shown in the following figure: