Define focal length ,radius of curvature, centre of curvature ,principal axis ?
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FOCAL LENGTH;
The focal length of the lens is the distance between the lens and the image sensor when the subject is in focus, usually stated in millimeters (e.g., 28 mm, 50 mm, or 100 mm).
RADIUS OF CURVATURE;
The radius of a circle of which a lens or a mirror is a part is called Radius of Curvature.
CENTRE OF CURVATURE;
The centre of a circle of which a lens or mirror is a part is called Centre of Curvature.
PRINCIPAL AXIS;
An imaginary line passing through the principle focus is called Principal Axis.
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