Explain the functions of the following parts of the eye :; (a) cornea (b) iris (c) pupil (d) ciliary muscles (e) eye-lens (f) retina (g) optic nerve
Answers
Answer:
a) Cornea helps in converging the light as it is the first place from where light passes into eyes.
b) Iris determines the amount of light that will enter the eye.
c) Pupil- Illumination in the eye is controlled by pupil.
d) Ciliary muscles- By the actions of the ciliary muscles, focal length of the eye lens can be changed.
e) Eye lens - Light is focused on to retina by eye lens.
f) Retina- Has rod and cone cells that has response mechanism to light and colour intenstity.
g) Optical nerve- Brain gets the image formed in retina with the helo of optical nerve.
Explanation:
(a) The function of the cornea is to allow the light to enter the eye. It is the front part of the eye.
(b) The function of the iris is to control the amount of light entering the eye.
(c) The function of the pupil is to control the illumination in the eye.
(d) The function of the ciliary muscles is to change the focal length of the eye-lens by changing its shape.
(e) The function of the eye-lens is to focuses light on to the retina.
(f) The function of the retina is respond to the intensity of light and colour of objects respectively with the help of rods and cones present in it.
(g) The function of the optic nerve is to convey the image formed on the retina to the brain.