What Is An Optical Centre?
What is the optical center? The optical center is the center of the lens through which light passes without deflection. This is the point where the lens will produce the sharpest image. The optical centre of a lens is described as the point on the primary axis through which light rays travel without deflection, or it can also be defined as the central point of the lens through which a light ray passes without deflection.
To understand this definition, consider a point source of light that is distant from the lens. The rays from this point source will be focused to form a converging spot on the lens's primary axis; this central spot's position is known as the optical centre.
It is possible to modify lenses in many ways, such as moving them closer to or further from a spot source, rotating it, etc., so that the optical centre remains at its original position. This can be seen by considering an image formed by a simple lens or simple telescope.
To explain the image formed by a concave lens, suppose it is placed so that its optical centre coincides with the image formed on its focal plane. In this case, light rays will be focused to form an image of the optical centre on the focal plane.
The vectors representing these points are known as front and back focal lengths, as they relate to the lens and its image.
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