Define principal axis for a lens ?
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the line joining the centers of the two spheres of which the lens forms a part this is called principal axis for lens
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Explanation:
- The imaginary line that is perpendicular to the vertical axis of the lens.
- It is defined as the line joining the pole of the mirror to the center of curvature.
- Any lines moving parallel to the principal axis, will pass parallel to the principal axis of the lens and the point where are ray after reflection meets is called principal focus of the lens.
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