Home » General Knowledge » GK Question “What Is The Eye Made Of?” general knowledge book English 2021 current affairs quiz and answers for class 7, 8, 9, 10, 12 students Exam.

GK Question “What Is The Eye Made Of?” general knowledge book English 2021 current affairs quiz and answers for class 7, 8, 9, 10, 12 students Exam.

What Is The Eye Made Of?

The human eye is like a camera. The opening is adjustable to admit light (the pupil); alens which focusses the light waves to form an image; and a sensitive film (the retina) on which the image is recorded.

There are about 1,30,000,000 light sensitive cells inside each human eye. When the light fells on one of these cells, it causes a quick chemical change with in the cell. In the nerve fiber this change starts an impulse. This impulse is, so to say, a message that travels through the optic nerve to the “seeing” part of the brain. The brain has understood what this message is about, arid what it means, so We know to have seen.

The shape of our eye is like a ball. It has a slight bulge in the front. There is a hole at the centre of this bulge and we call it the ‘pupil’. It looks black because it opens into the dark inside of the eye. Light passes through the pupil to the lens. The light is focused by lens. The picture is formed at the back of the eye-ball. Instead of film as in the case of a camera, there is a screen of light-sensitive cells, called the retina.

There is iris around the pupil. It is a doughnut-shaped ring coloured blue, or green or brown. The iris can change in size like the diaphragm of a camera. In bright light, tiny muscles expand the iris, so that the opening of the pupil is smaller and less light passes into the eyeball. In dim light, the pupil is opened wider and more light is admitted.

There is a strong membrane surrounding the eyeball. This is called ‘sclera’. The whites of the eye are part of the sclera. In front, where the eyeball bulges, selera is transparent. This part is called ‘Cornea’. The space between the iris and the cornea is filled with a clear, salty liquid and is called the ‘aqueous humour’. The space is lens shaped. It is in fact a liquid lens.

Other lens of eye is behind the pupil. Whatever happens can be seen, with the change in shape of the lens. When looking at near things the lens attains thickness. The lens becomes thinner while looking at distant objects.

Related posts:

What are star signs?Complete General Knowledge Question and Answer for Class 6, 7, 8, 9, 10, 11 and ...
General Knowledge
How does a fax machine work? Complete General Knowledge Question and Answer for Class 6, 7, 8, 9, 10...
General Knowledge
How was the Inca Empire destroyed? Complete General Knowledge Question and Answer for Class 6, 7, 8,...
General Knowledge
Do you know “Jain manuscript, a world treasure”.
Do you know
What is Wall Street? Complete General Knowledge Question and Answer for Class 6, 7, 8, 9, 10, 11 and...
General Knowledge
GK Question "Making Paper Was Discovered By Whom?" general knowledge book English 2021 current affai...
General Knowledge
What is forestry? Complete General Knowledge Question and Answer for Class 6, 7, 8, 9, 10, 11 and 12...
General Knowledge
How come spiders don't get trapped in their own webs? Complete General Knowledge Question and Answer...
General Knowledge
GK Question "Tell Me About Milky Way" general knowledge book English 2021 current affairs quiz and a...
General Knowledge
Where were the pyramids built? Complete General Knowledge Question and Answer for Class 6, 7, 8, 9, ...
General Knowledge
Why is Neptune blue? Complete General Knowledge Question and Answer for Class 6, 7, 8, 9, 10, 11 and...
General Knowledge
Why is our blood red in colour? Complete General Knowledge Question and Answer for Class 6, 7, 8, 9,...
General Knowledge
GK Question "Why Is It, That Moths Eat Wool?" general knowledge book English 2021 current affairs qu...
General Knowledge
GK Question "How Big Is Our Universe?" General Knowledge for Class 7, 8, 9, 10, 12 Students Examinat...
General Knowledge
Did the Celts have myths? Complete General Knowledge Question and Answer for Class 6, 7, 8, 9, 10, 1...
General Knowledge
Can starfish grow arms? Complete General Knowledge Question and Answer for Class 6, 7, 8, 9, 10, 11 ...
General Knowledge
Which was the first nation in the world to legalize abortion by law?
1st in the World
What is an antidote? Complete General Knowledge Question and Answer for Class 6, 7, 8, 9, 10, 11 and...
General Knowledge
What causes warts? Complete General Knowledge Question and Answer for Class 6, 7, 8, 9, 10, 11 and 1...
General Knowledge
When did the first aerial warfare take place?
1st in the World

About

Leave a Reply

Your email address will not be published. Required fields are marked *

*
*

This site uses Akismet to reduce spam. Learn how your comment data is processed.