Question

explain the function of pupil,retina and iris in the eye

Answer 1

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$\bold\red{Pupil:-}$Control the amount of the light

$\bold\pink{Retina:-}$ Image formation .


$\bold\green{Iris:-}$ Provide colour of eyes .

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Answer 2

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*PUPIL* : it is a small hole between the iris through which light enters the eye
In dim light, it opens up completely due to expansion of iris muscles, but in bright light it becomes very small due to contraction of iris muscles.


*RETINA* : it is the light sensitive surface of the eyes on which the image is formed.It contains light-sensitive cells rods and cones, Rod cells respond to the intensity of light and cone cells respond to the illumination. i.e. primary colours. Number of rod cells is greater than number of cone cells. These cells generate signals which are transmitted to the brain through optic nerves.


*IRIS* : it is a dark muscular diaphragm between cornea and the lens.
It controls the size of pupil.
it is the colur of iris that we call the colour of the eye



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