Human Eye and Colourful World Class 10 Full Chapter (Animation) | Class 10 Science Chapter 11 | CBSE
In this captivating video, we explore the intricate structure and remarkable function of the human eye, delving into how it perceives the vibrant colors of our world. Join us as we uncover the science behind vision, the role of light, and the fascinating ways in which our eyes interpret the colorful spectrum around us. This journey will enhance your understanding of both the anatomy of the eye and the beauty of the environment we inhabit. #HumanEye #ColorPerception #visionscience
STRUCTURE AND WORKING OF HUMAN EYE:
The human eye has the following parts :

Cornea : It is the transparent spherical membrane covering the front of the eye.
Iris : It is the coloured diaphragm between the cornea and lens.
Pupil : It is the small hole in the iris.
Eye lens : it is a transparent lens made of jelly like material.
Ciliary muscles : These muscles hold the lens in positions.
Retina : It is the back surface of the eye.
Blind spot : It is the point at which the optic nerve leaves the eye. An image formed at this point is not sent to the brain.
Aqueous humor : It is clear liquid region between the cornea and the lens.
Vitreous humor : The space between eye lens and retina is filled with another liquid called vitreous humor.In the eye, the image is formed on the retina by successive refractions at the cornera, the aqueous humor, the lens and the vitreous humor. Electrical signals then travel along the optic nerve to the brain to be interpreted. In good light, the yellow spot is most sensitive to detail and the image is automatically formed there.
WORKING OF THE HUMAN EYE
Light rays coming from the object to be seen can enter the eye through pupil and fall on the eye lens. The eye lens being convex, forms a real and inverted image on the retina. The light sensitive cell of the retina gets activated upon illumination and generate electric signals. These signals are sent to the brain via the optic nerve. The brain interprets these signals and finally gives rise to the sensation of vision.
THE FUNCTION OF IRIS AND PUPIL
The iris adjusts the size of the pupil according to the intensity of light received by the eye. The pupil regulates and controls the amount of light entering the eye. When the intensity of outside light is high, the pupil contracts so that less light enters the eye. When the intensity of the outside light is low, the pupil expands so that more light enters the eye and we can see properly.

Power of Accommodation:
The image of the objects at different distances from the eye are brought to focus on the retina by changing the focal length of the eye-lens, which is composed of fibrous jelly-like material, can be modified to some extent by the ciliary muscles.

Near Point and Far Point:
The nearest point at which a small object can be seen distinctly by the eye is called the near point. For a normal eye, it is about 25 cm and is denoted by the symbol D.

With advancing age, the power of accommodation of the eye decreases at the eye lens gradually loses its flexibility. For most of the old persons aged nearly 60 years, the near point is about 200 cm and corrective glasses are needed to see the nearby objects clearly.

The farthest point upto which our eye can seen objects clearly, without any strain on the eye is called the far point. For a person with normal vision, the far point is at infinity.

Least Distance of Distinct Vision:
The minimum distance of an object from the eye at which it can be seen most clearly and distinctly without any strain on the eye, is called the least distance of distance of distinct vision. For a person with normal vision, it is about 25 cm and is represented by the symbol D, i.e.
Least distance of distinct vision = D = 25 cm
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