Question

define principal axis

Answer 1

a line passing through the centre of the surface of a spherical mirror or lens and through the centre of curvature of all segments of the mirror or lens is called principal axis.


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Answer 2

Answer:

The principal axis of a spherical mirror is a line passing through the center of the mirror that is exactly perpendicular to the surface of the mirror.

the line passing through the optical center and the centers of curvature of the faces of a lens or curved mirror. any of the three mutually perpendicular axes around which the moment of inertia of the body is maximum.

optical axis, a straight line passing through the geometric center of the lens and connecting the two centers of curvature of its surfaces.

The optical axis of a lens is also called the principal axis.

The path of the light ray along this axis is perpendicular to the surfaces and as such will remain unchanged. All other ray paths passing through the lens and its optical center (the geometric center of the thin lens) are called secondary axes.

The term optic axis should not be confused with optic axis, a term used in crystallography.

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