Provide a wider field of view compared to plane mirrors.
Explanation
A convex mirror is a spherical mirror with a reflecting surface that bulges outwards. A fundamental property of convex mirrors is that, regardless of the object's position, they always form an image that is virtual, erect, and diminished (smaller than the object).
Analysis of Options
- Form real and inverted images of distant objects. is incorrect: Convex mirrors never form real or inverted images. Real and inverted images are characteristic of concave mirrors when the object is placed beyond the focal point.
- Eliminate the glare from headlights. is incorrect: While the divergence of light in a convex mirror may slightly reduce the intensity of reflected light, eliminating glare is not the primary reason for their selection. Glare reduction is typically managed by prismatic day/night mirrors or electrochromic auto-dimming features.
- Provide a wider field of view compared to plane mirrors. is correct: Because the image formed is diminished, a convex mirror compresses a larger scene into a smaller area. This provides a significantly wider field of view compared to a plane mirror of the same size, allowing the driver to see a larger area of the road and traffic behind the vehicle.
- Magnify the image of vehicles to show detail. is incorrect: Convex mirrors do not magnify images; they diminish them. Magnification (making the image larger than the object) is a property of concave mirrors when the object is placed within the focal length.
Key Takeaway: Convex mirrors are preferred in vehicles because they produce erect and diminished images, thereby offering a wider field of view that covers more traffic area than plane mirrors.