* White screen: This means the screen reflects all colors of light.

* Red light: This light source only emits red wavelengths.

* Green light: This light source only emits green wavelengths.

* Blue object: This object absorbs most colors of light, except blue, which it reflects.

Here's what will happen:

1. Red light: The red light will illuminate the blue object. Since the object absorbs most colors, it won't reflect the red light very well. It might appear a very dark red or even black.

2. Green light: The green light will illuminate the blue object. The blue object will absorb the green light, so you won't see much of the green light reflected. Again, it might appear a very dark green or even black.

Overall: The object will likely appear very dark, possibly close to black, because it's not reflecting either the red or green light well.