PSYCHOLOGY OF EMOTIONS

Detailed explanation-1: -Iris regulates the amount of light entering the eye by adjusting its size. Iris is a thin membrane, which controls pupil which in turn regulates the amount of light entering the eye.

Detailed explanation-2: -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.

Detailed explanation-3: -(ii) If the intensity of light is high, the iris makes the pupil contract in order to decrease the amount of light entering the eye.

Detailed explanation-4: -Light detected by the retina of your eye is converted to nerve impulses that travel down the optic nerve. Some of these nerve impulses go from the optic nerve to the muscles that control the size of the pupil. More light creates more impulses, causing the muscles to close the pupil.

Detailed explanation-5: -The size of the pupil is controlled by Iris. Iris contains a group of two smooth muscles attached at the corner of the pupil. They stretch when there is less light and shrink when it is too bright. These muscles are known as sphincter pupillae.