Question

define :-
1.Iris
2.retina
3.pupil

Answer 1

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here is ur answer ⏬⏬⏬

⚫ iris.... the coloured part of your eye


⚫ retina.. the area at the back of your eye that is sensitive to light and sends an image of what is seen to your brain...

⚫ pupil... The opening of iris...
The pupil is a hole located in the centre of the iris of the eye that allows light to strike the retina. 


$i \: hope \: its \: help \: u \:$
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Answer 2

Iris is a dark muscular diaphragm that controls size of the pupil

the human eye is like a camera .it's len forms an image on light sensitive screen called the retina.

pupil regulates and control the amount of light entering the eye