NCERT science solutions class 10 The Human Eye and The Colorful World
we will share some important notes on the eye structure, working of the human eye, and its defects. We will also discuss how these are corrected by using various lenses. So, let’s start with the human eye.
The human eye
- The Cornea is the front part of the eye. It is expanded towards outside and made up of a transparent substance. It is convex in shape and the light which comes to eye is enters through the cornea.
- Iris is behind the cornea and flat in shape, colored, and usually ring shape membrane.
- Pupil of the eye is the hole in the middle of the eye. As there is no reflection of light through the pupil hence it is black in color.
- A transparent, soft, flexible jelly like material is called eye-lens. The shape can be changes due to the flexibility which focus light on the retina.
- The eye-lens is held in position by suspensory ligaments.One end is attached to the eye-lens and other to ciliary muscle.
- The screen on which the image is formed in the eye is called Retina.
- Blind spot is a small area of the retina insensitive to light where the optic nerve leaves the eye.
Working of the Eye
The eye consists of a convex lens called eye-lens and a screen called Retina. The eye-lens forms a real image of the objects on the retina of the eye and we are able to see the objects.
In the eye, a convex lens called eye lens forms a real and inverted image of an object on the light sensitive screen called retina. The light rays coming from the object enter through the cornea of the eye, pass through the pupil of the eye and fall on the eye-lens. When the image falls on retina these light sensitive cells get activated and generate electric signals. The retina sends these electric signals to the brain through the optic nerves and gives rise to the sensation of vision.
HD-quality animated videos are available on the human eye and its structure, kindly click at Class 10 Science notes.
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