Search results
Check out the NCERT Solutions, Notes, Experiments, Activities and some Extra Questions for Chapter 16 Class 8 Science - Light. Everything is provided free of cost, and is the best education material available for Light Class 8.
Mar 13, 2024 · In NCERT Class 8 Science Chapter 13, we will learn about light, what are the laws of reflection, how the human eye works, etc. Let’s start with the chapter. What are the Laws of Reflection? The ray of light that strikes a surface, is known as the incident ray.
- hello@leverageedu.com
- Introduction to Light
- Laws of Reflection
- Regular and Diffused Reflection
- Dispersion
- Human Eye
- Visual Defects
- Seeing Sans Eyes
The world as we know it is largely known through senses, and the sense of sight is one of the most important senses. It is only when the light from an object enters our eyes that we see it. The light might have been either emitted by the object or reflected by it. Some of the important terminologies related to light are: Light is the energy that en...
Reflection
Light gets reflected off surfaces. Any surface that is really well-polished or shiny acts as a mirror. The phenomenon of light bouncing off surfaces is called reflection.
Laws of reflection
1. The ray of light that strikes a reflecting surface is called the incident ray, and the ray that gets reflected back is called the reflected ray. 2. The imaginary line that is perpendicular to the reflecting surface is called the normal. 3. The angle of incidence ∠i is the angle between the incident ray and the normal. The angle of reflection ∠r is the angle between the reflected ray and the normal. 4. Laws of Reflection: Angle of incidence ∠i is always equal to the Angle of reflection ∠r (...
Ray Diagram
The path taken by a narrow beam of light is depicted as a ray diagram.
Regular and diffused reflection
Reflection from a smooth surface like a mirror that follows the laws of reflection is called a regular reflection. Reflection over a surface that has irregularities where it does not follow the laws of reflection is called an irregular or diffused reflection.
Image formation in a plane mirror
1. The image formed by a plane mirror is always virtual, erect, and the object and image are equidistant from the mirror. 2. The image formed in a plane mirror undergoes lateral inversion.
Difference between the real and virtual image
A real image is formed by the actual convergence of light rays. In optics, a virtual image is an image formed when the outgoing rays from a point on an object always diverge. The image appears to be located at the point of apparent divergence. Because the rays never really converge, a virtual image cannot be projected onto a screen.
Dispersion of light
1. The splitting of light into its component colours is called dispersion. 2. Example: Rainbow
Human Eye
The human eye is a spherically shaped sense organ (diameter about 2.3 cm) that gives the sense of sight and helps us perceive colours and depth.
Functions of different organs in the human eye
1. Light enters the eye through a thin membrane that forms a transparent bulge on the front of the eye, called the cornea. 2. Iris is a dark muscular diaphragm that controls the size of the pupil. 3. The pupil is the small opening in the centre of the iris. 4. The lens, which is behind the pupil helps to adjust the focal length required to clearly focus on objects at various distances. 5. The retina is the screen where the images get formed. It is a delicate membrane with a large number of ph...
Visual defects
1. Visual defects include the inability to see near objects or the inability to see far objects. 2. In old people, the lens becomes cloudy, a condition called cataract that impairs vision.
Braille system
1. Braille is a system to read and write for visually impaired people. 2. Consists of 63 dot patterns or characters. 3. These patterns are embossed in braille sheets that can be recognized on touch. 4. The dots are raised in order to make it easier to touch. Learn more about the light and its various properties and other related topics, including NCERT class 8 Science notes, at BYJU’S. Also, Read
The "Chapter Notes - Light Class 8 Questions" guide is a valuable resource for all aspiring students preparing for the Class 8 exam. It focuses on providing a wide range of practice questions to help students gauge their understanding of the exam topics.
- (1.2K)
Light is a form of energy, which includes the sensation of vision in our eyes and make us able to see various things present in our surrounding. Properties of Light. It is form of energy. It travels in straight line. Light can form shadows. Laws of Reflection. There are 2 laws of reflection.
Light is topic-wise collection of Important notes, Topic Wise tests, Video lectures, NCERT Textbook, NCERT Solution, and Previous Year papers is designed in a way where you get a complete chapter-wise package for your preparation of Science for Grade 8 in one place?
People also ask
What is the best education material for Light Class 8?
What is Light Class 8 notes Science Chapter 13?
What is the note of refraction of Light Class 8?
Feb 19, 2019 · Light Class 8 Science Chapter 16 as per NCERT Book used in CBSE and other Schools. The lesson covers the complete explanation of class 8 Chapter 16 Light.
