A ray initially parallel to principal axis and close to it, after reflection, passes or appears to pass through-
Pole, Focus, Centre of curvature, anywhere on principal axis
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Reflection of Rays parallel to Principal Axis:
In the case of concave mirror: A Ray parallel to principal axis passes through the principal focus after reflection from a concave mirror. ... Since, a convex mirror diverges the parallel rays after reflection, thus it is also known as diverging mirror.
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