If Darryl stares for a long time at the guitar, and then stares at a white wall, what colour will the afterimage be?

Question

Quizplus · Accepted Answer

When you stare at a bright object for a long time, the light-sensitive cells in your eyes become fatigued. When you then look at a white surface, the fatigued cells are less sensitive to the light, so the afterimage appears in the complementary colour. The complementary colour of green is red.

If Darryl Stares for a Long Time at the Guitar