To achieve yellow light for a stage performance, which combination of buttons should Alice press?

To understand why the combination of red and green light produces yellow light, it is important to consider the principles of additive color mixing, which are relevant in both visual arts and lighting. In additive color mixing, different colors of light can be combined to create new colors. Red light and green light, when combined in the right intensity, can create yellow light because the brain processes these wavelengths as a blend.

When red and green lights mix together, they stimulate the photoreceptors in the eyes in such a way that the brain interprets the combination as yellow. This phenomenon is a result of how our visual system perceives color based on the wavelengths of light that are being absorbed by photoreceptors and how those signals are interpreted by the brain.

The other combinations and the absence of combination do not yield yellow light. For example, blue and red would create a purplish hue, and blue and green would generate a cyan color. No combination would yield yellow because each color mixes differently based on their inherent wavelengths. Understanding this provides insight into not just how we perceive color, but also the practical applications in situations such as stage lighting where specific colors are required for artistic expression.