Discussion
Stacking two coloured filters in a beam of light is
Answer: A
Correct answer: subtractive, since each removes part of the spectrum
The light must pass through both filters, so what emerges is what neither absorbed - the transmittances multiply. A cyan and a yellow filter together pass only green, and cyan with magenta and yellow together pass almost nothing. Superimposing the beams of two coloured lamps would be the additive case.
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