Final answer:
The light first passes through the pupil and then through the lens before it is focused on the retina. The correct answer is a) Pupil; lens.
Step-by-step explanation:
The light passes through aqueous humor, then through an opening in the iris called the pupil before entering the lens, where further focusing occurs. The correct answer is a) Pupil; lens.
The process of vision involves several steps where light enters the eye and is focused to create an image. First, light passes through the cornea, the clear protective covering of the eye. Then, it enters the eye through the pupil, which is the black opening in the iris that regulates the amount of light entering the eye by changing its size according to light intensity. After passing through the pupil, the light reaches the lens, a clear and curved structure that, along with the cornea, focuses the light on the retina. This precise focusing mechanism allows us to see clearly. The retina is lined with photoreceptor cells known as rods and cones that convert light into nerve impulses which are then sent to the brain.