Question

explain the functions of the following parts of the human eye.(a) cornea (b)iris (c)pupil (d)eye lens (e)retina

Answer 1

(a)cornea: is the crystalline part which refracts the light rays into the eys.
(b)iris: is the part responsible for controlling the diameter and size of the pupil
(c)pupil: it is the small hole which lets in the light rays into the eyes.it can alter the amount of light entering it too.it acts as a diaphragm.
(d)eye lens: it is the part behind the pupil .it will change the size(i.e it changes the focal length)where the eye is made to focus various distances.the movement of this is controlled by the ciliary muscles.
(e)retina: it is the screen placed at the back.it shows the real and inverted image created and the optic nerves send the impluse to the brain later.the retina has 2 parts namely the rods and cones.cones would show the colour objects where rods the opposite.

hope it helps !!!