For a concave mirror, what happens to a ray parallel to the principal axis after reflection? 
AIt passes through the principal focus.
BIt is reflected back along the same path.
CIt appears to come from the principal focus behind the mirror.
DIt becomes perpendicular to the principal axis.
Answer & Solution
Correct answer: A. It passes through the principal focus.
One of the standard ray rules for a concave mirror is that a ray parallel to the principal axis reflects through the principal focus. Option C describes a convex mirror, while option B applies to a ray passing through the centre of curvature.
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