11. Human Eye and Colourful World - Class 10 Science English CBSE Notes
CBSE Notes for Class 10 are one of the most useful study resources for students who want to understand every chapter clearly and perform well in school examinations. At ATP Education, we provide carefully prepared chapter-wise CBSE Notes for Class 10 based on the latest CBSE syllabus and NCERT curriculum. These notes are designed to simplify learning, improve conceptual understanding, and help students revise important topics quickly before examinations.
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Every chapter is explained in a simple and student-friendly manner so that learners can understand difficult concepts without confusion. Whether you are preparing for class tests, periodic assessments, half-yearly examinations, annual examinations, or board-oriented assessments, our Class 10 CBSE Notes help you revise the complete syllabus in less time while covering all the important concepts.
11. Human Eye and Colourful World - Class 10 Science English CBSE Notes
11. Human Eye and Colourful World
11. Human Eye and Colourful World
Human Eyes:
The human eye is one of the most valuable and sensitive sense organs. It is spherical in shape and it works like a camera. We can able to see this colourful world. It has a crystalic lens which forms an image on an another light sensitive part of eyes called retina. The light passes into eyes through a thin membrane called cornea. There is an another structure behind the cornea called iris. This controls the size of pupil. Pupil is a dark muscular diaphragm (hole like structure) that controls the amount of light entering into eye. The light-sensitive cells of retina get activated upon illumination and generate electrical signals. These signals are sent to the brain via the optic nerves.
The Part of Eye:
(1) Cornea: Cornea is a thin membrane of outer and blackish part of eye through which light enters into the eye. It makes outer covering of anterior portion of eye.
(2) Iris: Iris is a dark muscular diaphragm that controls the size of the pupil. it is situated just behind the cornea.
(3) Pupil: The pupil regulates and controls the amount of light entering into the eye.
(4) Ciliary Muscle: It controls the curvature of eye lens by relaxation and contraction causing changing in focal length of lens.
(5) Vitreous Humour: The remain eye ball fulled with fluid like substances called Vitreous Humour. Which located between eye lens and retina. It gives the spherical shape to the eye ball.
(6) Retina: The retina is a delicate membrane having enormous number of light-sensitive cells. It works as screen to form image by eye lens.
There are two types of light-sensitive cells present on Retina
(i) Cylindrical:
(ii) Conical:
(7) Optic Nerve: It is a main nerve that join eye to brain. Signals passes to the brain via optic nerve.
(8) Crystalic Lens: This is a convex lens which is composed of a fibrous, jelly like material.
The nature of Image formed by eye lens: Real and inverted.
The curvature of eye lens is modified to some extent by the ciliary muscles. This change in the curvature of eye lens can thus change its focal length.
Increasing in focal length: When the ciliary muscles are relaxed, the lens becomes thin. This causes its focal length increases. This enables us to see distant objects clearly.
Decreasing in focal length: When we looking at closer objects, the ciliary muscles contract. This increases the curvvature of the eye lens. This causes eye lens thicker. Consequently, the focal length of the eye lens decreases. This enables us to see nearby objects clearly.
Power Of Accommodation:
The ability of the eye lens to adjust its focal length is called accommodation.
Near Point : The minimum distance, at which objects can be seen most distinctly without strain, is called the least distance of distinct vision. It is also called the near point of the eye. For a young adult with normal vision, the near point is about 25 cm.
Far Point: The farthest point upto which the eye can see objects clearly is
called the far point of the eye. It is infinity for a normal eye.
11. Human Eye and Colourful World
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11. Human Eye and Colourful World
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11. Human Eye and Colourful World
This page is under construction.
11. Human Eye and Colourful World
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Reading the complete textbook is essential for building knowledge, but revision notes help students organize that knowledge effectively. Our CBSE Revision Notes for Class 10 summarize every chapter by highlighting important concepts, definitions, keywords, formulas, examples, and important points that students should remember during examinations. This approach saves valuable study time and makes revision much easier.
Students often find it difficult to revise lengthy chapters before examinations. Our notes solve this problem by presenting important information in a structured format that is easy to understand and remember. Regular revision using these notes helps improve confidence and strengthens conceptual clarity.
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Each chapter included in the CBSE Notes for Class 10 section is prepared according to the latest academic session. Every topic is explained in simple language while maintaining accuracy and completeness. Students can easily revise important concepts, learn key points, and strengthen their understanding of each chapter.
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