A marine biologist observes a highly textured, multi-coloured coral reef during a bright, sunny afternoon. Later, they return to the exact same spot during a night dive under very dim, ambient starlight without using a torch.
Describe and explain two differences in the visual image perceived by the biologist under these two distinct lighting conditions. Your answer must refer to the specific photoreceptors involved and their pathways to the brain.
A military pilot preparing for a low-intensity night flight is instructed to sit in a darkened ready-room before taking off.
What is the physiological term for the process of the eye adjusting its sensitivity to these low ambient light conditions?
Choose one option:
Explain, in terms of photopigments and retinal pathways, why the pilot must wait at least 303030 to 454545 minutes in complete darkness for this process to be fully effective before taking off on their low-light mission.
