Question

The mirror used in automobiles to see the rear view is:
A. Concave
B. Convex
C. Plane
D. None of these

Answer 1

Hint: The rear view mirror should be able to see most of the traffic behind.

Complete step by step answer:
The mirror used in automobiles is small and it should be able to show a large part of the road behind for safety purposes. In other words, the image should be extremely focused, diminished and virtual. The mirror should be able to form a clear distinct image even when the object is at infinity. This can be achieved by using a convex mirror.

So, the correct answer is “Option B”.

Additional information:
Convex mirrors are also used in hallways of hospitals, apartments, schools and hotels at the places where the hallways make a sudden sharp turn or intersect. They are also used in roads and cycle lanes to enhance safety by increasing visibility and providing warning about incoming vehicles.

Note:
Convex and plane mirrors form only virtual, erect images. Concave mirrors form both real and virtual images. Real images are formed when the object is placed at a distance larger than the focal length. Virtual images are formed if the object is placed at a distance less than the focal length.