funtions of iris, pupil and retina
Answers
The role of iris is to control the ampunt of light entering by changing the size of the pupil
Iris :Iris controls the size of pupil regulating the light that reaches the retina. For better understanding, fold your fingers to form a fist in the below manner.
Pupil :The pupil is essentially a hole in the center of your iris that controls how much light enters the eye. It's size is controlled by the relaxing and contracting of the iris. When there is high light intensity, the pupil shrinks while it grows in low light intensity. This is to ensure there is enough light for vision without damaging the sensitive retina.
Retina :The lining of the back of the eye containing two types of photoreceptor cells - Rods (sensitive to dim light, black and white) and Cones (sensitive to colour). This detects the light in the way a film would in a camera.
Hope this will help you ^_^