You use the same technique as in the previous level, the double jump. Create a portal on the bounce board, the one on the wall, step through, as you fall towards the floor, create a portal on the floor, which will give you momentum to jump through the force field.
Create a blue portal on the wall, left of the 45 degree bounce board, then an orange portal in the same location on the right wall. Once the sphere receiver has the sphere you then have to get back to the room you came from. Use the double jump again, place a blue portal on the highest tile to the left or right, then an orange portal on the wall, step through and create an orange portal on the floor below, again you will have enough momentum to fly through the force field and back to the room you came from.
