Why concave mirrors cannot be used as rear view mirrors in vehicles?
Concave mirrors are not suitable for use as rear view mirrors in vehicles due to the following reasons:
- Focal point:
- Concave mirrors have a focal point where all light rays parallel to the principal axis converge. This focal point is located in front of the mirror, making it unsuitable for use as a rear view mirror where the driver needs to see objects behind the vehicle.
- Image formation:
- Concave mirrors produce virtual and upright images when the object is placed beyond the focal point. This would result in an inverted and smaller image of objects behind the vehicle, making it difficult for the driver to judge the distance and size of objects.
- Field of view:
- Concave mirrors have a limited field of view due to their curved surface. This restricted field of view would not allow the driver to see a wide area behind the vehicle, increasing the chances of blind spots.
- Distortion:
- Concave mirrors can cause distortion in the reflected image due to their curved surface. This distortion can make it challenging for the driver to accurately judge the position and distance of objects behind the vehicle.
In conclusion, convex mirrors are preferred for use as rear view mirrors in vehicles as they provide a wider field of view, produce upright and smaller images of objects behind the vehicle, and minimize distortion. These features help the driver to have a clearer and more accurate view of the surroundings while driving.