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To draw the image formed by a concave mirror, we use four rules. Likewise, we follow four rules to construct the image formed by a convex mirror.
Rule 1:
A ray of light passing parallel to the principal axis of a convex mirror appears to be coming from its principal focus after reflection from the mirror.
A ray of light passing parallel to the principal axis of a convex mirror appears to be coming from its principal focus after reflection from the mirror.
(Note: All rays behind the convex mirror shall be shown with dotted lines.)
A ray of light passing parallel to the principal axis
Rule 2:
A ray of light going towards the centre of curvature is reflected back along the same path.
A ray of light going towards the centre of curvature
Rule 3:
A ray directed towards the principal focus of a convex mirror will emerge parallel to the principal axis after reflection.
A ray directed towards the principal focus
Rule 4:
When a ray strikes the convex mirror at an angle to the principal axis and towards the pole, it is reflected obliquely. At point \(P\), the incident and reflected rays make equal angles with the principal axis, following the laws of reflection.
A ray strikes the pole of a convex mirror.
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