How is a spherical mirror used diverge a beam of light from the point?
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A concave mirror. If parallel rays of light falls on a concave mirror, the reflected rays converge to the focus of the mirror.
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spherical mirror is a type of convex mirror as we see its outside surface and concave from inside but we see it as convex,so when a beam of light strikes its surface,as surface is not plane,it is diverged to a much more extend as used at road corners so the driver can see what's coming from other side,
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