Name the three special rays which are used to draw the ray diagrams for a spherical lens and trace its path.

Three rays are:
1. ray Parallel to the principle axis
2. Ray passing through the focus of the point
3. ray passing through the centre of the curvature.

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  1. parallel to principal axis
  2. passing through focus (f1)
  3. passing through centre of curvature (2f1)
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