Light: Reflection
Reflection is one of the unique properties of light. It is the reflection of light, which enables us to see any object.
Reflection: The bouncing back of rays of light from a polished and shiny surface is called reflection or reflection of light. It is similar to bouncing back of a football after colliding with a wall or any hard surface.
Laws of Reflection of light:
- The angle of incidence and angle of reflection is equal.
- The incident ray, reflected ray and normal to the point of reflection lie in the same plane.
The angle of incidence is denoted by 'i' and angle of reflection is denoted by 'r'. The law of reflection is applicable to all types of reflecting surface.
Mirror and Reflection of Light:
Mirror is a shiny polished object (glass) which reflects most of the rays of light falling upon it. One side of mirror is polished with suitable material to make the other side reflective.
Types of Image formed by mirrors:
Real Image: Image which is formed in front of the mirror and it can be obtained on a screen is called real image.
Virtual Image: Image which is formed behind the mirror and cannot be obtained on a screen is called virtual image.
Types of Mirror:
Plain Mirror: A mirror having a flat surface is called plane mirror.
- A plane mirror always forms virtual and erect image.
- The distance of image and that of object is equal from the mirror.
- The image formed by a plane mirror is laterally inverted.
Spherical Mirror
Mirrors having curved reflecting surface are called spherical mirrors. A spherical mirror is a part of a sphere.
Types of Spherical Mirror:
Concave Mirror: Spherical mirror with reflecting surface curved inwards is called concave mirror.
Convex Mirror: Spherical mirror with reflecting surface curved outwards is called convex mirror.
Important terms in the case of spherical mirror:
Pole: The centre of reflecting surface of a spherical mirror is known as Pole. Pole lies on the surface of spherical mirror. Pole is generally represented by ‘P’.
No comments:
Post a Comment