To construct ray diagram we use two light rays which are so chosen that it is easy to know their directions after reflection from the mirror. List these two rays and state the path of these rays after reflection. Use these rays to locate the image of an object placed between centres of curvature and focus of a concave mirror.
CBSE OUTSIDE DELHI - SET 1 2012
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- Ray incident parallel to the principal axis after reflection passes through the focus (for concave mirror) or appears to have diverged from. (for convex mirror)
- Incident ray passing through the principal focus (for concave mirror) or directed towards the focus (for convex mirror) after reflection emerges or appears to emerge parallel to the principal axis.
- Incident ray passing through centre of curvature (for concave mirror) or directed towards the centre of curvature (for convex mirror) is reflected back along the same path.
- A ray incident obliquely to the principal axis towards pole of the mirror obliquely. The incident ray and the reflected ray make the same angle with the principal axis.
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