On 31-12-2009 12:16, Orchid XP v8 wrote:
> somebody wrote:
>> There are two light sources, pure red and green, practically 
>> coincident and
>> pointing in the same direction. You place a filter that's a perfect 
>> yellow
>> blocker in the path. What colour light would you see past the filter?
> 
> You realise there's a difference between a binary-yellow filter and a 
> unary-yellow filter, right? You haven't specified which one.
> 
You mean high-pass or band pass?

BTW welcome back. Skiing again?

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