Class 8 Exam > Class 8 Notes > Science Class 8 > Important Points - Light
Important Points - Light | Science Class 8 PDF Download
Points to remember:
1.) There can be only one reflected ray for a given single incident ray falling on a plane mirror.
2.) A ray of light which is incident normally on a mirror is reflected back along the same path because the angle of incidence for such a ray of light is 0 degree. Therefore, the angle of reflection is also 0 degree.
3.) Diffuse reflection is caused by the roughness in the reflecting surface of an object.
4.) Laws of reflection are valid for both regular reflection & irregular reflection.
1.) There can be only one reflected ray for a given single incident ray falling on a plane mirror.
2.) A ray of light which is incident normally on a mirror is reflected back along the same path because the angle of incidence for such a ray of light is 0 degree. Therefore, the angle of reflection is also 0 degree.
3.) Diffuse reflection is caused by the roughness in the reflecting surface of an object.
4.) Laws of reflection are valid for both regular reflection & irregular reflection.
Fig: Reflection of light.5.) If a person is standing at a distance of 1 metre in front of a plane mirror, then distance between the person & his image will be 2 metres.
6.) In an image formed by plane mirror, the left side of the object appears on the right side in the image whereas the right side of the object appears on the left side in the image.
This change of sides of an object & its mirror image is called Lateral inversion.
7.) As the angle between the two plane mirrors decreases, the number of images formed increases.
When the angle between the two plane mirrors becomes 0 degree i.e. When the two mirrors are parallel to each other then infinite number of images is formed.
8.) An interesting feature of a kaleidoscope is that we can never see the same patterns again. Every time a new pattern is formed. Kaleidoscope are used by designers of wall papers & fabrics, as well as by artists to get ideas for new patterns.
6.) In an image formed by plane mirror, the left side of the object appears on the right side in the image whereas the right side of the object appears on the left side in the image.
This change of sides of an object & its mirror image is called Lateral inversion.
7.) As the angle between the two plane mirrors decreases, the number of images formed increases.
When the angle between the two plane mirrors becomes 0 degree i.e. When the two mirrors are parallel to each other then infinite number of images is formed.
8.) An interesting feature of a kaleidoscope is that we can never see the same patterns again. Every time a new pattern is formed. Kaleidoscope are used by designers of wall papers & fabrics, as well as by artists to get ideas for new patterns.
Question for Important Points - LightTry yourself: What is the reason behind the formation of diffuse reflection?View Solution
Fig: Kaleidoscope.9.) Rainbow in the sky is natural phenomenon showing the dispersion of sunlight. Rainbow is produced by the dispersion of sunlight by the tiny rain drops suspended in the atmosphere (which act as tiny prisms made of water).10.) The adjustment of the size of pupil takes some time. That’s when we go from a bright light to a darkened cinema hall, at first we cannot see our surroundings clearly.
Fig: Rainbow.11.) The range of vision of a normal human eye is from infinity to about 25 centimeters.
The document Important Points - Light | Science Class 8 is a part of the Class 8 Course Science Class 8.
All you need of Class 8 at this link: Class 8
|
91 videos|273 docs|44 tests
|
FAQs on Important Points - Light - Science Class 8
| 1. What is light? |  |
Ans. Light is a form of electromagnetic radiation that is visible to the human eye and is responsible for our sense of sight. It travels in straight lines and can be described as a wave or a particle called a photon.
| 2. How does light travel? | |
Ans. Light travels in straight lines at a constant speed of approximately 299,792 kilometers per second in a vacuum. It can also travel through transparent materials such as air, water, and glass, but its speed may be slightly slower due to interactions with the medium.
| 3. What are the properties of light? | |
Ans. Light has several properties, including intensity, frequency, wavelength, and polarization. Intensity refers to the brightness of light, while frequency determines its color. Wavelength is the distance between two consecutive peaks or troughs of a light wave, and polarization refers to the orientation of the electric field component of light.
| 4. How does light interact with matter? | |
Ans. Light can interact with matter in several ways. It can be reflected, where it bounces off the surface of an object, or refracted, where it changes direction as it passes through a medium. Light can also be absorbed, where it is taken in by an object, or transmitted, where it passes through a material without being significantly absorbed or reflected.
| 5. What are some practical applications of light? | |
Ans. Light has numerous practical applications in various fields. Some examples include lighting, communication systems (such as fiber optics), photography, lasers, medical imaging (such as X-rays and ultrasound), and solar energy generation. Light also plays a crucial role in vision and the functioning of our eyes.
About this Document
|
7.6K Views |
|
4.60/5 Rating |
|
Nov 22, 2024 Last updated |
Document Description: Important Points - Light for Class 8 2024 is part of Science Class 8 preparation.
The notes and questions for Important Points - Light have been prepared according to the Class 8 exam syllabus. Information about Important Points - Light covers topics
like and Important Points - Light Example, for Class 8 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for Important Points - Light.
Introduction of Important Points - Light in English is available as part of our Science Class 8
for Class 8 & Important Points - Light in Hindi for Science Class 8 course.
Download more important topics related with notes, lectures and mock test series for Class 8
Exam by signing up for free. Class 8: Important Points - Light | Science Class 8
Description
Full syllabus notes, lecture & questions for Important Points - Light | Science Class 8 - Class 8 | Plus excerises question with solution to help you revise complete syllabus for Science Class 8 | Best notes, free PDF download
Information about Important Points - Light
In this doc you can find the meaning of Important Points - Light defined & explained in the simplest way possible. Besides explaining types of
Important Points - Light theory, EduRev gives you an ample number of questions to practice Important Points - Light tests, examples and also practice Class 8
tests
|
Explore Courses for Class 8 exam
|
|
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
Related Searches
video lectures
,Sample Paper
,Important Points - Light | Science Class 8
,Important questions
,mock tests for examination
,study material
,Free
,Exam
,Important Points - Light | Science Class 8
,Previous Year Questions with Solutions
,ppt
,MCQs
,past year papers
,Important Points - Light | Science Class 8
,Summary
,shortcuts and tricks
,Semester Notes
,Viva Questions
,Extra Questions
,Objective type Questions
,practice quizzes
;
Additional Information about Important Points - Light for Class 8 Preparation
Important Points - Light Free PDF Download
The Important Points - Light is an invaluable resource that delves deep into the core of the Class 8 exam.
These study notes are curated by experts and cover all the essential topics and concepts, making your preparation more efficient and effective.
With the help of these notes, you can grasp complex subjects quickly, revise important points easily,
and reinforce your understanding of key concepts. The study notes are presented in a concise and easy-to-understand manner,
allowing you to optimize your learning process. Whether you're looking for best-recommended books, sample papers, study material,
or toppers' notes, this PDF has got you covered. Download the Important Points - Light now and kickstart your journey towards success in the Class 8 exam.
Importance of Important Points - Light
The importance of Important Points - Light cannot be overstated, especially for Class 8 aspirants.
This document holds the key to success in the Class 8 exam.
It offers a detailed understanding of the concept, providing invaluable insights into the topic.
By knowing the concepts well in advance, students can plan their preparation effectively.
Utilize this indispensable guide for a well-rounded preparation and achieve your desired results.
Important Points - Light Notes
Important Points - Light Notes offer in-depth insights into the specific topic to help you master it with ease.
This comprehensive document covers all aspects related to Important Points - Light.
It includes detailed information about the exam syllabus, recommended books, and study materials for a well-rounded preparation.
Practice papers and question papers enable you to assess your progress effectively.
Additionally, the paper analysis provides valuable tips for tackling the exam strategically.
Access to Toppers' notes gives you an edge in understanding complex concepts.
Whether you're a beginner or aiming for advanced proficiency, Important Points - Light Notes on EduRev are your ultimate resource for success.
Important Points - Light Class 8 Questions
The "Important Points - 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. These questions cover the entire syllabus, ensuring comprehensive preparation.
The guide includes previous years' question papers for students to familiarize themselves with the exam's format and difficulty level.
Additionally, it offers subject-specific question banks, allowing students to focus on weak areas and improve their performance.
Study Important Points - Light on the App
Students of Class 8 can study Important Points - Light alongwith tests & analysis from the EduRev app,
which will help them while preparing for their exam. Apart from the Important Points - Light,
students can also utilize the EduRev App for other study materials such as previous year question papers, syllabus, important questions, etc.
The EduRev App will make your learning easier as you can access it from anywhere you want.
The content of Important Points - Light is prepared as per the latest Class 8 syllabus.
|
© EduRev
|
Education Revolution
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup