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- thickest at the center
- brings rays together
- thinnest at the center
- refract rays outwards
rules for drawing ray diagram
- 1. from tip of object rays parallel to the principal axis will refract and go through the prime focus
- 2. The ray will go from tip of object through the optical center
- 3. The ray will go through the secondary focus through the lens and parallel to the principal axis.
a line drawn through the optical center perpendicular to the surfaces of the lens
geometric center of lense