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CBSE Notes for Class 10 Science chapter 11. Human Eye and Colourful World: Introduction, quick revision notes for Class 10 Science chapter 11. Human Eye and Colourful World Introduction, Chapter-wise CBSE Revision Notes, CBSE Notes PDF Free Download, CBSE One Liner Notes Class 10, Half Yearly Revision Notes, CBSE Revision Notes Class 10 Science
Get CBSE Notes for Class 10 Science Chapter 11. Human Eye and Colourful World: Introduction prepared by experts as per the latest NCERT syllabus and CBSE exam pattern. These concise and easy-to-understand notes cover important definitions, formulas, diagrams, and key concepts from the chapter to help students in quick revision and effective exam preparation. Whether you are studying for school tests, board exams, or competitive exams, these notes provide a reliable study resource. Designed in simple language with point-wise explanations, they save time and enhance learning efficiency. Download free PDF notes, explore solved examples, and strengthen your understanding of [Topic Name] for scoring high marks. Perfect for Class 10 students who want clear, structured, and exam-oriented notes for CBSE Science.
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.
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Ace your exams with CBSE Notes for Class 10 Science chapter 11. Human Eye and Colourful World: Introduction. These notes provide a clear explanation of important concepts, formulas, diagrams, and solved examples from the NCERT syllabus. Specially designed for Class 10 students, the notes are structured in a simple, point-wise manner to make revision quick and effective. Whether you are preparing for school tests, board exams, or competitive exams, these Science notes will boost your confidence and save valuable study time. You can also download Science class 10 chapter 11. Human Eye and Colourful World free PDF notes for offline learning. With easy-to-grasp language, exam tips, and well-organized content, these CBSE Science notes on chapter 11. Human Eye and Colourful World – Introduction are the perfect study companion for scoring high marks and mastering the subject.
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