Final answer:
When a green and a red beam of light intersect on a paper, the color produced is yellow due to the process of additive color mixing, where the two light colors combined create a new color perceived by the eyes. Option C is correct.
Step-by-step explanation:
When a green beam of light and a red beam of light fall on the same spot on the paper, the resulting color seen on the paper will be a mix of the two colors.
When light colors are mixed together, they are added to each other, a process known as additive color mixing. The green light has a wavelength of about 495-570 nm and red light has a wavelength of about 620-750 nm. When these colors are combined, they create yellow light, not white, violet, or red alone.
In additive color mixing, combining red light and green light results in yellow because each color of light adds its own subset of the visible spectrum to the mix.
Since our eyes perceive color based on the combination of stimuli from the different types of cones (photoreceptor cells in our retina), when both red and green light stimulate the cones in our eyes, we see the color yellow. So, the correct answer to which color would be seen on the paper is C. Yellow.