In the vertebrate eye, the __________ focuses light on the photoreceptors.

• A. retina
• B. pupil
• C. fovea
• D. iris
• E. lens

Answer: (E)

Verified step by step guidance

1. Begin by understanding the anatomy of the vertebrate eye. The eye is composed of several parts, each with a specific function in the process of vision.
2. Identify the role of each part mentioned in the options: retina, pupil, fovea, iris, and lens. The retina is responsible for receiving light and converting it into neural signals. The pupil regulates the amount of light entering the eye. The fovea is a small pit in the retina that provides sharp central vision. The iris controls the size of the pupil. The lens focuses light onto the retina.
3. Recognize that the lens is the part of the eye that focuses light onto the photoreceptors located in the retina. This is crucial for forming clear images.
4. Understand the process of accommodation, where the lens changes shape to focus on objects at different distances, ensuring that light is properly focused on the retina.
5. Conclude that the lens is the correct answer because it is the structure responsible for focusing light on the photoreceptors in the vertebrate eye.