What are the properties of Red/Green/Blue that make them the primary colors for light? Are they the only set of three colors that could combine to make all other colors?

Question

And I have the same question for pigment primary colors (magenta/cyan/yellow).

In: Physics

Answer 1

Our eyes have three different types of “cones” that respond to slightly different wavelengths of light. Light looks red, green, or blue depending on which cones it stimulates.