Which part is the adjustable opening in the center of the eye through which light enters?

Which part is the adjustable opening in the center of the eye through which light enters?

• A. Iris
• B. Pupil
• C. Cornea
• D. Lens

Answer: (B)

Light enters the eye through an opening in the center of the iris called the pupil. The iris has muscles that adjust this opening, making the pupil larger in dim light to let in more light and smaller in bright light to reduce light. This control helps protect the retina and optimize vision. The cornea and lens then refract and focus the incoming light onto the retina.

Light enters the eye through an opening in the center of the iris called the pupil. The iris has muscles that adjust this opening, making the pupil larger in dim light to let in more light and smaller in bright light to reduce light. This control helps protect the retina and optimize vision. The cornea and lens then refract and focus the incoming light onto the retina.