Light Blog 1
CLASS 8 CHAPTER 16
Light
Day 1
Day 1
“If you are the light, you cast away the darkness.” ManHee Lee😊
Dear Learners,
Happy Learning!😊
At the end of today topic, you will be able to:
1. Define Light.
2. Tell Reflection of Light and terms related to it.
3. Explain the laws of reflection.
4. Justify the laws of reflection.
2. Tell Reflection of Light and terms related to it.
3. Explain the laws of reflection.
4. Justify the laws of reflection.
Important Instruction:
1. Make the new entry of the chapter in your index.
2. Start the chapter from fresh page.
3. Copy new terms given at the start of chapter need to copied in your notebook.
4. Text written in red need to READ very carefully.
5. Diagram need to be drawn with pencil. It should be well labelled.
Lets begin, the topic of today............
But, actually we start our chapter, click on the link below for an introduction to LIGHT.
We see a variety of objects in the world around us. However, we are unable to see anything in a dark room. On lighting up the room things become visible.
What makes things visible???
During the day, the sunlight helps us to see object. An object reflects light that falls on it. This reflected light is received by our eyes enables us to see.
Light is a form of energy that enable us to see. We are clear that we can see the luminous bodies even in the dark because they emit light whereas the non-luminous bodies cannot be seen in dark.
Luminous and Non-luminous Objects:
Here, we need to understand that when light falls on an object or any surface, it may pass through it, it may get absorbed by it or it may bounce back after striking the object or surface.
A highly polished surface, such as a mirror, reflects most of the light falling on it. This is called as reflection of light.
Reflection of Light: Bouncing back of light rays after hitting any surface is called reflection of light
Light is known to behave in a very predictable manner. If a ray of light could be observed approaching and reflecting off of a flat mirror, then the behavior of the light as it reflects would follow a predictable law known as the law of reflection.
Laws of Reflection:
Law 1: The angle of incidence is equal to the angle of reflection. (∠i = ∠r)
Law 2: The incident ray, the reflected ray and the normal lies on the same plane.
(Draw the diagaram)
Link for Laws of Reflection: https://www.youtube.com/watch?v=YFgSHRCRa6k
We should also need to know certain terms related to reflection of light.
1. Incident ray of light: The ray of light which falls on an object is called Incident ray of light.
2. Reflected ray of light: The ray of light which gets bounced back or reflected from the surface of an object is called reflected ray of light.
3. Angle of incidence: The angle between the incident ray and the normal at the point of incidence is called angle of incidence ∠i.
4. Angle of reflection: The angle between the reflected ray and the normal is called angle of reflection ∠r.
Experimental Proof for Law of Reflection:
I hope you now have the clear understanding about light and laws of reflection. Click on the following link for more details.
Home Assignment:
1. Read page no 247, 248, 249
1. Read page no 247, 248, 249
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