Question

Define the following term
1 Radiur of curuature
2 Principal Axis ​

Answer 1

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Radius of curvature

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✰In differential geometry, the radius of curvature, R, is the reciprocal of the curvature. For a curve, it equals the radius of the circular arc which best approximates the curve at that point. For surfaces, the radius of curvature is the radius of a circle that best fits a normal section or combinations thereof.......♛

Principal Axis

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✰An optical axis is a line along which there is some degree of rotational symmetry in an optical system such as a camera lens or microscope. The optical axis is an imaginary line that defines the path along which light propagates through the system, up to first approximation.......♛

Answer 2

➤ Answer :-

⟶ Radiur of curuature :-

• The center of curvature of a curve is found at a point that is at a distance from the curve equal to the radius of curvature lying on the normal vector. It is the point at infinity if the curvature is zero. The osculating circle to the curve is centered at the centre of curvature.

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⟶ Principal Axis :-

• A line passing through the center of the surface of a lens or spherical mirror and through the centers of curvature of all segments of the lens or mirror.