Incandescent Lamp: Red & Green Light Filter Color

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Discussion Overview

The discussion centers on the color of light observed when white light from an incandescent lamp is passed through a red filter followed by a green filter. The scope includes conceptual reasoning about light filtering and color perception.

Discussion Character

  • Conceptual clarification, Debate/contested

Main Points Raised

  • One participant suggests that since red and green are complementary colors, passing light through both filters would result in darkness, as the red filter blocks non-red light and the green filter blocks red light.
  • Another participant questions whether all colors except red and green would be visible, implying a broader spectrum might be considered.
  • A later post reiterates that red filters pass red light while green filters pass green light, and concludes that the combination of the two would lead to no light passing through, resulting in darkness.

Areas of Agreement / Disagreement

Participants express differing views on the outcome of the filtering process, with some asserting that darkness results while others explore the possibility of other colors being visible. No consensus is reached.

Contextual Notes

Participants do not clarify the selectivity of the filters or the ideality of the light sources, leaving assumptions about filter behavior and light interaction unresolved.

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What color of light would be observed if white light from an incandescent lamp were passed first through a red filter and then through a green filter.
 
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We can explain this phenomenon with "complementary colors". Red and green are complementary colors to each other (if I'm not wrong), so at the end I expect that darkness will result, since red filter doesn't pass red light and green light remains, and this is stopped by green filter, so no light can pass unless there is a deviation from ideality.
 
so the colors that would show up would be all the colors from an rainbow except for red and green?
 
please help?
 
dg_5021 said:
What color of light would be observed if white light from an incandescent lamp were passed first through a red filter and then through a green filter.

red filters pass red light. green filters pass green light.
depending on how selective your filters are, the red filter will remove any light that isn't red. Since the green filter removes anything that isn't green, the leftover red light will be removed by the green filter and you will end up with dark.
 

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