state the path after reflection in a sperical mirror when the incident ray:

A. Passes through the principal focus.

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Solution

An incident ray which passes throughthe focus of the mirror is reflectedparallel to the principal axis. Anincident ray which passes through the centre of curvature of the mirror isreflected back along its own path(since it is normally incident on themirror).

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An incident ray which passes through the principal focus, after reflection on a concave mirror, emerges.....................

For an incident ray directed towards centre of curvature of a spherical mirror, the reflected ray :

(a) retraces its path

(b) passes through the focus

(d) becomes parallel to the principal axis.

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