Why is the ray of light parallel to the principal axis passes through the focus?
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this is the rule of image formation by mirror .
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Explanation:
Any ray travelling parallel to the principal axis in case of concave mirror is supposed to pass through principal focus after being reflected from mirror surface .However a ray of light parallel to principal axis and coincident with it intersects mirror surface at pole and just retraces it's path after reflection therefore satisfying the condition of being parallel to principal axis as well as being reflected at pole of mirror.
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