Rules concave mirror Rule 1 when light ray is moving parallel to the principal axis towards the mirror, it passes through the principal focus 'F' after reflection. Rule 2 when light ray passes through the principal focus 'F', it goes parallel to the principal axis after reflection. Rule 3 when light ray is incident on the pole of the mirror, it simply reflects from the pole. Rule 4 when light ray passes through the centre of curvature 'C', it bounces back on its initial path. convex mirror Rule 1 when light ray is moving parallel to the principal axis towards the mirror, it goes in opposite direction to the principal focus after reflection. Rule 2 when light ray approaches towards the principal focus, it goes parallel to the principal axis after reflection. Rule 3 (same as concave mirror) Rule 4 when light ray approaches towards the centre of cu
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