The following Topics and Sub-Topics are covered in this chapter and are available on MSVgo:
As already stated, light is a form of energy that causes a sensation of vision in the eyes and allows us to see things. The study of light in physics is known as Optics, and it is an essential concept for advanced physics. Light causes a sensation of vision in the eyes. For example, light from a torch and motorcycles causes a sensation of sight in the eyes. Light always travels in a straight line unless the direction of light is changed using reflection and refraction concepts.
Reflection is a phenomenon when the light bounces back to the emitting medium after striking a surface. Different surfaces react differently when the light strikes:
Following are the properties of images formed by the mirrors:
There are two broad types of mirrors:
Spherical mirrors are of 2 types:
Concave Mirror and Uses
Spherical mirrors with a reflected surface curved inwards are known as concave mirrors. They are also referred to as converging mirrors.
Uses of Concave Mirror:
Convex Mirror and Uses
Spherical mirrors with a reflected surface curved outwards are known as concave mirrors. They are also referred to as diverging mirrors.
Uses of Convex Mirror:
The object’s image is formed in both the mirrors as the image in the first mirror becomes the object for the second mirror. The following are the characteristics of images included in a pair of mirrors:
According to the law of reflection, the angle of reflection is equal to the angle of incidence, which means that the distance between the mirrors and the object is the same as the distance between the mirrors and the image formed. Using this concept, the image’s location created in the plane mirror can be calculated as the distance is the same but in opposite directions.
A total of three images are formed when an object is placed between two perpendicular plane mirrors.
When an object is placed between a pair of parallel plane mirrors, an infinite number of images are formed.
Light is a straight line electromagnetic radiation of any wavelength visible to human eyes that can be deviated using reflection and refraction concepts. The chapter ‘Light’ is not only an essential topic for class 9th physics, but it is also a necessary concept for advanced physics. This chapter’s thorough knowledge will smoothen your journey through the upcoming physics and science chapters.