The aphotic zone is O a light zone sometimes referred to as the 'twilight zone' a light zone below the photic zone where only dim light is found a light zone where only blue light penetrates a light zone at the ocean surface where photosynthesis occurs a light zone completely devoid of sunlight The aphotic zone is_ O a light zone sometimes referred to as the 'twilight zone' a light zone below the photic zone where only dim light is found a light zone where only blue light penetrates a light zone at the ocean surface where photosynthesis occurs a light zone completely devoid of sunlight