CBSE Class 8 Chapter 16 Light Revision Notes
CBSE Class 8 Science Chapter 16 Light Revision Notes are by far the best and most reliable Revision Notes for Light. These CBSE Class 8 Science Chapter 16 Light Revision Notes provided here are prepared by our subject experts at Swiflearn to help students to recall important concepts and points related to Chapter 16 Light of CBSE Class 8 and in turn, enhance their confidence.
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What makes things visible
Some objects emit light, like the Sun and stars or a light bulb. And some objects reflect light when light falls on them. For example, water. When light falls on any object, some part of the light reflects back and some part of it is absorbed. When reflected light from an object enters our eyes, we see the object. The light may have been emitted by the object or may have been reflected by it.
Properties of Light:
● It is a form of energy.
● It travels in a straight light.
● It can form a shadow.
Laws of reflection
Whenever light bounces back from the surface of an object, it is called reflection. There are two laws of reflection as listed below.
▪ First Law of Reflection: The incident ray, the reflected ray, and the normal lies in the same plane.
▪ Second Law of Reflection: The angle of incidence is always equal to the angle of reflection. ∠i = ∠r. The angle of incidence is denoted by ‘i’ and angle of reflection is denoted by ‘r’.
Note – The laws of reflection are applicable to all types of reflecting surfaces.
A reflection that is formed on a smooth surface like that of a mirror is called regular reflection Example – Image is formed a mirror is an example of regular reflection.
When the surface is rough and all the parallel rays falling on it are reflected in different directions, the reflection is known as diffused or irregular reflection. It is caused by the irregularities in the reflecting surface, like that of cardboard.
Some of the common features of an image formed by a plane mirror:
1. The image will always be behind the mirror.
2. The image will be virtual, i.e., it cannot be obtained on a screen.
3. The image will be erect and inverted.
4. The size of the image will be equal to object size.
5. The distance of an image from the mirror is equal to the distance of the object from the mirror.
CBSE Class 8 Chapter 16 Light Revision Notes PDF