CONVEX
Ray 1 is parallel to the axis until it reaches the lens then refracts, passing through the focal point on the right.
Ray 2 passes through the center without bending
Ray 3 passes through focal point on the left until it reaches the lens then refracts, parallel to the axis.CONCAVE
Ray 1 is parallel to the axis then refracts through the lens so that, when dotted back, it passes through the focal point.
Ray 2 passes through center without bending.
Ray 3 aims for the secondary focus, refracts through the lens and runs off parallel to the axis on the other side of the lens.MIRROR
cite:http://dev.physicslab.org/Document.aspx?doctype=3&filename=GeometricOptics_ConvergingLenses.xml, http://dev.physicslab.org/Document.aspx?doctype=3&filename=GeometricOptics_DivergingLenses.xml, http://dev.physicslab.org/Document.aspx?doctype=2&filename=GeometricOptics_ManMirrorSolution.xml
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