The optical centre of a lens, represented by the letter O, is the central point of the lens. A ray of light passing through the optical centre does not undergo any deviation. It is a crucial point for understanding the behavior of light passing through the lens.
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The optical center of a lens is the point where the principal axis intersects the lens and is often denoted as “O.” In thin lenses, this point is considered to be the midpoint of the lens. The optical center is crucial because it is the point through which incident rays travel undeviated. Consequently, when an object is placed on the principal axis, the rays passing through the optical center remain undisturbed, simplifying calculations in lens formulas. This simplification is particularly valuable when analyzing image formation and magnification in the context of thin lenses with small apertures.