CBSE Class 10 Science Revision Notes Chapter 11

CBSE Class 10 Science Revision Notes Chapter 11 – Human Eye and Colorful World

Class 10 Science is a tough subject to crack. It is vital for students to read, revise and practice all the chapters thoroughly to score better in examinations. But, as the course is very vast, it becomes difficult for students to revise all chapters in one go. So, Extramarks has simplified this for students. The portal has all the revision notes that have been developed by experts. 

Students can visit the website and check CBSE Class 10 Science Revision Notes Chapter 11 – Human Eye and Colorful World. All the content included in these CBSE revision notes are important from the examination point of view so candidates should study them properly. In addition to revision notes, students can also find CBSE sample papers, CBSE previous year question papers, important questions and CBSE extra questions.

CBSE Class 10 Science Revision Notes for the Year 2022-23

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CBSE Class 10 Science Chapter 11 – Human Eye and Colorful World Revision Notes – (Add revision notes PDF)

Access Class 10 Science Chapter 11 – Human Eye and Colourful World Notes

Defects of Eye

• Colour blindness occurs due to a deficiency in which an individual is not able to distinguish between certain specific colours. Genetic factors are one of the most common causes. Disturbance occurs when the amount of pigment per cone is reduced or absent. 
• Nyctalopia is the inability of an individual to see in relatively low light. The deficiency of vitamin A is one of the most common causes of this disease. 
• The opacity in the crystalline lens of the eye is known as a cataract. It can develop due to several reasons such as exposure to UV rays, radiation, etc. 
• A condition in which a person cannot see near objects clearly but has a clear vision for distant objects is known as hypermetropia. 
• Myopia is a condition in which a person cannot see distant objects. 
• Astigmatism is one of the commonly occurring eye diseases in which disaster images are formed as the light rays are unable to meet a common focus. 

Human Eye and Colorful World Class 10 Notes

Contents of Ch 11 Science Class 10 Notes

The topics covered in Class 10 Science Chapter 11 Notes are as follows: 

• Scattering of light 
• Atmospheric refraction 
• Dispersion of white light by a glass prism 
• Refraction of light through a prism 
• Defects of vision and their correction 
• The human eye

Class 10 Science Ch 11 Notes: A Brief Overview

Here is a brief overview of Chapter 11 Science Class 10 Notes:

Structure of eye: The main points included in the topic are given below. 

• Cornea: It is the front part of the eye. 
• Iris: The muscles involved to control the eyes. 
• Lens: Convex lens is present in humans. 
• Retina: The inner part of the eye with sensory muscles. 
• Sclera: The muscular layer of the eye. 
• Vitreous Humor: Fluid in the eye. 
• Aqueous humour: The fluid in the eye. 

Eye defects: 

The major defects that can occur in the human eye are as follows: 

• Myopia: Nearsightedness
• Hyperopia: Distant vision is clear but near vision is affected 
• Presbyopia: Inability to accommodate the eye
• Cataracts: age-related eye disease
• Colour blindness: The inability of an individual to distinguish between colours. 

Refraction of light through a prism: 

When different wavelengths of light pass through the prism it bends resulting in the splitting of light into various colours forming a rainbow. 

Dispersion of white light by a glass prism: 

The white light when passed through a glass prism disperses forming an array of colours (VIBGYOR). 

Atmospheric Refraction: 

The deflection of the electromagnetic wave caused by the earth’s atmosphere fluctuation in air density as a function of altitude is called atmospheric refraction.

Scattering of light: 

As the light passes from one medium to another some of it is absorbed by the particle’s medium before radiating into a specific direction. This phenomenon is known as the scattering of light. 

Tips to Prepare from CBSE Class 10 Science Chapter 11 Notes

Candidates can follow the below-mentioned tips if they are preparing for the Class 10 board examinations. 

• One should start by properly reading the NCERT books. They contain the most important questions and concepts from the examination point of view. 
• Practice the sample papers, previous years’ question papers, etc. properly to understand the type of questions asked in the examination.
• One should practice the diagrams properly to score well in the examination.

Why Choose Extramarks Notes of Ch 11 Science Class 10?

• These revision notes are created according to the latest CBSE guidelines so candidates can rely on it for board exam preparation.
• They have easy-to-understand language. 
• All important topics are covered in it.
• Examples are used in the revision notes for a better understanding of the concept.