Quote:
Originally posted by llama8
If you brought two tv sets together they would be twice as loud only if the waves of vibration were 'perfectly' in phase.
Your two torches probably wouldn't be twice as bright but would more then likely be brighter.
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Phase isn't the only consideration. I don't know about light for sure, but I suspect that it is like sound in that increases in power function more on the log scale than the linear one. Not to mention the effect of distance on the whole equation - doubling the distance from a source quarters the amount of energy received. This is quick and dirty. If I have a chance I'll look up the details later and post a better explanation.