The 16th chapter of Class 8 Science NCERT book will discuss the properties of light, laws of reflection, multiple reflections, and the physiology of our eyes. The sections are mentioned below.
What Makes Things Visible?
Laws of Reflection
Regular And Diffused Reflection
Reflected Light Can Be Reflected Again
Sunlight: White or Coloured?
What is Inside Our Eyes?
Care Of The Eyes
Visually Impaired Persons Can Read And Write
What is the Braille System?
What You Have Learnt?
All these sections will elaborately describe the concepts of light rays, the laws they follow and how our eyes perceive them. There will be apt examples and proper descriptions of these concepts for a better understanding of the students. When needed, you can use our Light Chapter Class 8 solution to find out how a question is answered. It will help you to understand what the questions want you to learn and you can prepare this chapter well for your exams.
The introduction of Light Chapter Class 8 will tell you about the senses we use to perceive our environment and how light is sensed by our eyes. It will also discuss how important our eyes are to judge the environment we are in. We use our sense of vision for judging different objects and measuring their characteristics to make a decision. Different examples such as rainbows, moon, stars, birds, etc will be used to introduce the student to the basic concepts of light.
What makes things visible?
After the introductory part, this first section will tell the students about how a light ray falls on an object and reflects to cast an image. In this part, the students will come to know how our sense of vision works using the reflected light falling on our eyes. It will also prove that our eyes need reflected light to see any object by using the example of darkness. It will take you to the next section where the Class 8 Science Chapter 16 will discuss how light falls on a surface and then gets reflected in a particular direction.
Laws of Reflection
This section will start with an activity where the students will be demonstrated how a light ray travels using an experiment. It will be clear that light travels in a straight path and also gets reflected following a rectilinear path too. Using simple items, a student will be able to find out the facts and analyze them. In fact, he will also discover the three main components of the Laws of Reflection which are the incident ray, the reflected ray and the reflecting surface.
This section will also tell the students about the concept of a light ray. How a narrow beam of light is considered as a ray to understand the concept of the laws will be clarified. On using a drawing method, the students will find out how an incident ray, reflected ray and a normal/perpendicular is drawn on a reflecting surface. They will also find out the ways to figure out the angle of incidence and the angle of reflection using the result of the activity. Consider referring to the figures and descriptions when you are reading about the new terms. You can also refer to the Class 8 Science Chapter 16 solutions to understand what this section is trying to convey. This section will also recollect how a virtual image is formed on a plane mirror and the concept of lateral inversion taking place in its formation. The laws will be proved by the experiment and activity done by the students under the supervision of a teacher.
Regular and Diffused Reflection
In this part of the Light for Class 8 chapter, you will find out fascinating facts about regular and diffused reflection. It will be easier for you to figure out the difference between these two terms and also how the laws of reflection are maintained in both cases. The recollection of the properties of the real and virtual image read by the students in Class 7 will be done in this section so that you can correlate with the new concepts easily. On proceeding further, you will find out the basic concept of regular and diffused reflection using daily examples.
Reflected light can be reflected again
The next section will describe how reflected light gets reflected again falling on a smooth or rough surface. It will describe how a plane surface can produce multiple images if the reflected light repeatedly falls on it. A simple example of a barber using a small mirror to show the back of your head will demonstrate the fact. In this section of NCERT Class 8 Science Chapter 16, you will be introduced to the concept of multiple images and later on, it will be elaborated.
The 5th section of this chapter will demonstrate elaborately how multiple images are formed due to the incidence of reflected rays on two reflecting surfaces places parallel or inclined to each other. According to the previous segment, you will have a small idea of how multiple images exist. Here, you the chapter will describe this phenomenon with certain examples in the activity section to elaborately discuss multiple image formation. Using inclined mirrors and kaleidoscope, the students will find out more about multiple image formation. Refer to the NCERT solutions of Science for Class 8 for this section so that you can understand this new concept and answer all the questions accordingly.
Sunlight- white or coloured?
In this small section, the students will come to know about the true colours of sunlight. It will discuss the different colours forming a spectrum cast on a screen when a light ray passes through a small slit or hole in a black paper. The proper splitting of sunlight will reveal the colours.
What is inside our eyes?
In the previous sections, we have studied how reflected light falls on our eyes and we can see the objects. You must be curious about how the reflected rays prepare an image we can perceive. This section will elaborate on the process of image formation inside our eyes by precisely describing its physiological terms. Every part of our eyes responsible to construct an image from receiving the reflected rays will be discussed with proper dogmatic illustrations.
The students will also come to know about the concept of a blind spot with the help of an activity. It will depict how a human eye cannot see or sense an object at a particular position. On proceeding further, it will also describe how the impression of an image persists for about 1/16th second. For this, images merge together sometimes. On using a bird-cage image experiment, the students will understand its effect perfectly. This section of Class 8 Science Chapter 16 will describe how our eyes show us images of our surroundings. It will also describe the most suitable distance for us to read, look or perceive an object. The age-related issues in our eyes will also be discussed at the end of this section.
Care of the eyes
Eyes are the most important sense organ for any animal. These sense organs offer a view of the surrounding which is very important for an animal to react. This is why NCERT has included a section based on how we can take care of our eyes to avert certain issues. The point-wise presentation of eye care will help a student to understand every step’s importance in taking care of our eyes. It will also tell us what to eat and provide ample nutrition to keep our eyes healthy. The questions based on this section can be answered using the NCERT solutions for Class 8 Science Chapter 16 Light. Follow the answers and imbibe the concepts properly.
Visually impaired persons can read and write
Due to certain inventions and innovations, visually-impaired persons can also read and write. Limited or no vision can resist a blind person from understanding letters, numbers, etc and stop him from learning how to read and write due to impaired judgement. In this case, it has been found that blind people develop better senses due to their visual impairment. It means they have an excellent sense of touch. Utilizing this concept of highly developed sensory capabilities, non-optical aids are developed for them to study. Tactical aids concentrating to deliver knowledge by using different sensory organs are used. In this section, the students will come to know about this kind of innovations developed to help visually impaired persons to read, listen and understand. Our Light NCERT solution for Class 8 Science Chapter 16 will help you to find out the actual answers to the questions mentioned in the exercise regarding this section properly.
What is the Braille System?
The best resource for blind persons to read is the Braille System. It was developed by Louis Braille, an eminent person who was visually challenged too. In 1821, he invented a new way of reading and writing using dots on the paper so that the visually-challenged persons can read, write and present their thoughts. It is accepted internationally as this system is capable of interpreting common languages, scientific notations and mathematics. In this section, a concise view of the Braille System will be described for the understanding of the students. It will also discuss how Helen Keller and other excellent examples benefitted from this system. On following our Class 8 Science Chapter 16 Light question answer, you can easily find out the basics of this system and create a foundation to understand its importance for the blind people.
What you have learnt?
This end part of Light Chapter of Class 8 will discuss what the students have learned from the previous sections. This section will help a student to recall the concepts precisely and will help them to study well. This section is then followed by the exercise with questions based on the concepts you have learned.
Chapter 1 CROP PRODUCTION AND MANAGEMENT
In the first chapter, the students will be taught about the practices of crop production and its management. They will learn how new measures are taken for better yield and safer storage.
Chapter 2 MICROORGANISMS: FRIEND AND FOE
The second chapter will teach the students about different types of microbes linked to diseases, as well as, food processing, medicine manufacturing, etc.
Chapter 3 SYNTHETIC FIBRES AND PLASTICS
In this chapter, the students will learn about different synthetic fibres and plastic used in our daily life. The process of their extraction and characteristics will be discussed elaborately.
Chapter 4 MATERIALS: METALS AND NON-METALS
This chapter will introduce the students to the concept of metals and non-metals, their oxides and how acids and bases are formed.
Chapter 5: COAL AND PETROLEUM
This chapter will concentrate on the extraction and use of fossil fuels. It will also teach the students of Class 8 about their by-products and their usage.
Chapter 6: COMBUSTION AND FLAME
The 6th chapter will discuss how combustion occurs and the factors supporting it. It will also discuss the different types of combustions and fuel efficiency.
Chapter 7: CONSERVATION OF PLANTS AND ANIMALS
The 7th chapter will concentrate on how the conservation of different plants and animals are done. It will also describe why conservation if a necessary step to protect the environment.
Chapter 8: CELL - STRUCTURE AND FUNCTIONS
In this chapter, the students will learn about the different organelles inside the plant and animals cells. They will also read about their functions and structural features.
Chapter 9: REPRODUCTION IN ANIMALS
In this chapter, the students will be taught about sexual and asexual reproduction methods adopted by animals. The techniques of different species will be discussed in a reprise way.
Chapter 10: REACHING THE AGE OF ADOLESCENCE
Here, the chapter will discuss what specific changes occur when a human enters puberty after adolescence. It will also discuss the primary and secondary sexual characters developing in a human signifying the changes.
Chapter 11: FORCE AND PRESSURE
The concept of force and pressure will be introduced to the students. Here, different types of forces will be described with examples.
Chapter 12: FRICTION
Proceeding forward, the students of Class 8 will learn about friction, its merits and demerits in real-life examples.
Chapter 13: SOUND
This chapter is based on sound, its source and how it is produced. New terms like vibrations, sound energy, etc related to this concept will be taught.
Chapter 14: CHEMICAL EFFECTS OF ELECTRIC CURRENT
In this chapter, a student will come to know about the various chemical changes a stream of current can bring in a solution and its commercial uses.
Chapter 15: SOME NATURAL PHENOMENA
This chapter will elaborately discuss several natural phenomena and their causes. It will also teach students about precautionary measures taken for safety during natural calamities.
Chapter 17: STARS AND THE SOLAR SYSTEM
This chapter will describe the concepts about stars, constellations and our solar system. It will also describe what natural and artificial satellites are.
Chapter 18: POLLUTION OF AIR AND WATER
The 18th chapter of this book will teach students about different types of pollution and the common pollutants in air and water.
Vedantu is dedicated to formulating the ideal NCERT Solutions for Class 8 Science Chapter 16 so that the students can find ease in preparing this chapter and imbibe the new concepts for further implementation. The answers present in Light Chapter of Class 8 PDF solution can be referred to anytime. Download this solution for NCERT Science Class 8 Chapter 16 Light and engage in a constructive way to study these new concepts so that you can answer the questions properly and ace the exams. Build a strong foundation based on the concepts described in the book and follow our answering patterns to understand the core ways to approach a question
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