I'm on the quest Revealing the unseen, objective Focus the oculory. The guy in the room tells me the crystal now needs to be "focused" using cold and heat spells. I have moved the lenses in the roof around using the oculory controls so that they are each positioned pretty close to a light beam. I also found the tomes of flames and frostbite laying on a table near said oculory controls.
The problem is that after probably an hour of screwing around, I have come to the conclusion that NOTHING in this room responds in any way to either of the spells. I have literally scorched and frozen every reachable centimetre of this room, especially the lenses and focus crystal, and the light beams aren't even slightly moving.
EDIT TO ADD TO THE ABOVE: I have also tried blasting all of the lenses with fire-then-ice, ice-then-fire, both at the same time, and all of the above in various combinations and durations. No effect what so ever.
In addition I have both left the area and returned and restarted the game. Has the quest bugged up terribly with me or is there something I haven't thought of?
STATUS UPDATE: This YouTube video shows how the objective is done. This does not work for me, so I assume that the mission is bugged. I'll mark the answer that helps me finish the objective as correct.