Yellow objects, they reflect light, yellow light, red and green light. If there is a blue light, falling objects, yellow blue light is absorbed, not reflected objects are black.
The yellow light yellow. Red light and green light. If the blue light incident on the yellow and blue light is absorbed does not reflect saw a black object.
The Yellow object will reflect the yellow, red and green. If the blue light hits the object yellow blue light will be absorbed to reflect the object is black.