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A concave lens is one that is thinner in the center and thicker at the edges. These
lenses, like convex lenses, are classified as:
bi-concave
Plano - concave
convexo - concave
Terminology Used in Optics
Optical Centre
It is the focal point of a lens. It is represented by the letter O. A ray of light passing
through the optical center of a lens does not deviate in any way. It is also known as
an optic center.
Principal Axis
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