ANATOMY

Detailed explanation-1: -Pupil: The pupil is the opening at the center of the iris through which light passes. The iris adjusts the size of the pupil to control the amount of light that enters the eye. Retina: The retina is the light-sensitive tissue at the back of the eye.

Detailed explanation-2: -Cornea: a clear dome over the iris. Pupil: the black circular opening in the iris that lets light in.

Detailed explanation-3: -The pupil is the hole located in the center of the iris. It allows light to enter the eye. The pupil appears black because light rays entering the pupil are absorbed by the tissues inside the eye.

Detailed explanation-4: -The pupil is an opening that lets light into your eye. Since most of the light entering your eye does not escape, your pupil appears black.