If a green filter is placed behind a yellow filter, what occurs?

When a green filter is placed behind a yellow filter, the outcome is that no light passes through. To understand this, one must consider how filters interact with light. A yellow filter allows only yellow light (a combination of red and green wavelengths) to pass through. However, when the green filter is placed behind it, the situation changes.

The green filter allows only green light to pass through and blocks other colors. Since the yellow filter does not allow pure green light (as green light is not one of the components that it transmits), when green light reaches the yellow filter, it is absorbed and not transmitted. Therefore, the combination of the two filters results in the blockage of all light, leading to the conclusion that no light will be able to pass through the setup.