Nature of Images in a Concave Mirror and its Applications
We all love to see the mirror
The light falling on a mirror is always reflected back.
Therefore, we can look at ourselves in a mirror.
Let us learn more about mirrors.
A mirror is a shiny or polished surface that reflects a clear image.
When light from an object falls on a mirror, it is reflected back and the image is formed on the screen.
Images can be of two types i.e. Real image and Virtual image.
A real image is formed on the screen while a virtual image cannot be formed on the screen.
Let us now study the types of mirrors.
There are two types of mirrors, Plane mirror and Curved mirror.
A curved mirror is also known as a Spherical mirror which is further classified into Concave and Convex mirror.
If the outer surface of a curved mirror is painted then the inner surface becomes the reflecting surface, such a mirror is known as the Concave mirror.
If the inner surface of a curved mirror is painted then the outer surface becomes the reflecting surface, such a mirror is known as the Convex mirror.
Here. we’ll study about the concave mirror in detail.
When light is incident on a concave mirror, it converges at a point and reflects back.
Hence, it is also known as the Converging mirror.
When the concave mirror is placed very close to the object, a magnified and virtual image is formed.
As the distance between the object and the mirror increases...
...the size of the image reduces and a real image is formed.
So the image formed by the concave mirror can be small or large and it can also be real or virtual.
The table above shows the nature of images formed in a concave mirror.
Let us know the application of Concave mirror
A concave mirror reflects light inward to one focal light, therefore, it is mostly used to focus light.
A concave mirror is used as a shaving mirror.
During shaving, the concave mirror forms an enlarged and erect image of the face when the mirror is held closer to the face.
Concave mirrors are widely used in headlights of vehicles and automobiles.
The light source is placed at the focus of the mirror, so after reflecting the light rays travel over a huge distance as parallel light beams of high intensity.
Concave mirrors are also used in making astronomical telescopes.
In an astronomical telescope, a concave mirror of a diameter of 5 meters or more is used as the objective.
The image formed by the concave mirror can be small or large and it can also be real or virtual.
This is based on the distance between the object and the mirror.