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The lens is primarily responsible for focusing light in the eye. It is a transparent structure located behind the iris and the pupil, and it changes shape to adjust the focal distance, allowing us to see objects at various distances clearly. This ability to adjust its shape is known as accommodation. When focusing on nearby objects, the lens becomes thicker and more curved, increasing its refractive power. Conversely, when focusing on distant objects, it flattens out.

While the cornea does contribute significantly to the eye's overall refraction, it provides a fixed amount of curvature and primarily handles the initial bending of light as it enters the eye. The retina plays a different role by capturing the light that has been focused and converting it into electrical signals sent to the brain. The pupil functions as an aperture, controlling the amount of light that enters the eye but does not have a role in focusing that light. Hence, the lens is the key component for adjusting focus, making it the correct answer.