Convex mirror is used as rear view mirror as it gives a clear diminished and an erect image of the traffic that is behind you. Also, has a large field of view i.e. it covers a wide range of the traffic behind you and gives a very clear image.Just imagine the fact that you are using a concave mirror. Everything behind you will be enlarged and tilted from the original position and you can’t see the actual traffic behind you. Even a plain mirror is not used as it does not cover a wide surface for the traffic.Hence, a convex mirror is used.

A convex mirror is used for a rear view mirror. this is bcoz of the fllwimg reasons:-it has a wider field of view-it always produces diminished and erect images, also shows all vehicles on d road.

The mirror used for rear view image is a convex mirror.

Explanation:
A convex mirror is used as a rear-view mirror in vehicles because of its unique properties that allow for a wider field of view and a diminished image size. Let's delve into the details of why a convex mirror is preferred for this purpose.

The Ray Diagram:
To understand the functioning of a convex mirror, we can analyze it using a ray diagram. Consider a convex mirror with the incident ray parallel to the principal axis.

1. Incident Ray: A ray of light, parallel to the principal axis, strikes the convex mirror.
2. Reflection: The ray reflects off the mirror's surface.
3. Reflected Ray: The reflected ray diverges away from the principal axis.
4. Virtual Focus: By extending the reflected rays backward, they appear to converge at a point behind the mirror. This point is called the virtual focus.
5. Image Formation: The virtual focus is the apparent source of the reflected rays, forming a virtual image behind the mirror.
6. Image Characteristics: The virtual image formed by the convex mirror is always virtual, diminished, and upright.

Advantages of a Convex Mirror:
Now, let's explore why a convex mirror is specifically used as a rear-view mirror:

1. Wide Field of View: A convex mirror provides a wider field of view compared to a flat or concave mirror. It allows the driver to have a greater range of vision, reducing blind spots and enabling a comprehensive view of the surroundings.
2. Diminished Image Size: The virtual image formed by a convex mirror is smaller than the actual object. This reduction in size helps to fit a larger area within the driver's field of view, making it easier to perceive the overall traffic conditions.
3. Upright Image: A convex mirror produces an upright image, which means there is no need for the driver to mentally adjust for an inverted image. This facilitates quick and accurate interpretation of the reflected scene.
4. Increased Safety: The wide field of view and diminished image size provided by a convex mirror enhance safety while driving. They allow the driver to monitor the rear traffic effectively, enabling timely decisions and maneuvering.

Conclusion:
In conclusion, a convex mirror is used for rear-view images due to its wide field of view, diminished image size, and upright image formation. These properties make it an ideal choice for rear-view mirrors in vehicles, ensuring improved safety and situational awareness for drivers.