Question

Write one use of the following:
1) Retina
2) Cornea
3) Pupil
4) Iris
5) Rod
6) Cones
7) Optical nerve
8) Eye lans

Answer 1

Retina: Sensative organ after choroid it acts as screen of eye. on retina image is formed there are large no. of rods & cons cell on retina . optical nerve are found.

Cornea: transparent bulgig front part of eye.cornea is transparent sclerotic layer. cornea allows light to enter into eye. most of refraction of light occurs through cornea.

Optical Nerve: these are nerve fibre which connect the rod cones cells of retina to brain .they transfer optical image to brain in form of electric signals.

Iris: behind the cornea the dark muscular diaphragm is know as iris.iris has coloured pigment which gives colour to eye