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The reflective surface of a convex mirror bulges outward towards the light source. When light rays pass through this surface, they spread out (or diverge) away from each other so they end up forming a virtual image where everything appears smaller.
A concave mirror's reflective surface bulges inward away from the light source. These mirrors collect the light rays that come through them and converge those light rays all onto a single focus point.
A parallel beam of light that is falling on a concave mirror is converged to one focal point and the reflected image is depending on the distance between the object and the curved mirror.
A parallel beam of light that is falling on a convex mirror is diverged toward an imaginary focus. Since the image is smaller than in a plane mirror, the convex mirrors cover a large area of view.
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