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The points on the optical axis OO' (see Figure 1) of a centered optical system that can be used to construct the image of an arbitrary point in space for objects in the paraxial region, which is the region around the axis of symmetry of the system where a point is represented by a point, a straight line by a straight line, and a plane by a plane.

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Q: What is the cardinal point of optical system?
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How do optical isomers rotate plane of plane polarised light?

REFER : optical rotatory dispersion


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