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To construct a ray diagram we use two rays of light which are so chosen that it is easy to determine their directions after reflection from the mirror. Choose these two rays and state the path of these rays after reflection from a concave mirror. Use these two rays to find the nature and position of the image of an object placed at a distance of 15 cm from a concave mirror of focal length 10 cm.

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Ray1 When an incident ray is parallel to the principal axis of the mirror, its reflected ray must pass through the principal focus of the concave mirror or it appears to pass through the focus of convex mirror. Ray2 When the principal ray passes through or appears to pass through the centre of curvature the light after reflection from spherical mirror emerges parallel to the principal axis.

The image formed is real, inverted and magnified. It is formed beyond the centre of curvature.

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