One is not allowed to "benefit" from the lights of the channukah candles. Rashi says the reason is in order that it should be recognizable that these candles are light for the mitzvah in order to "l'farsem hanas" (to promote the miracle.) The Ran says the reason is because that these lights are similar to that of the Menorah (in the Beis Mikdash) that one is not allowed to have benefit from, so to the channukah candles. Would this din also apply if one is benefiting from the light that is reflected in a mirror? The reason why I am asking and think that it might not be a problem according to Rashi is because one doesn't necessarily see that you are benefiting from the "actual" candles and therefore according to Rashi it's still recognizable that these candles are for the mitzvah. Perhaps according to the Ran it's more a problem since one is still benefiting from the light. However maybe it's only the "direct" light that would be a problem according to the Ran.