Question

$What is meant by the term Principal Axis?$​

Answer 1

$\huge\fbox\pink{✯Principal Axis✯}$

• The line passing through the center of the surface of a lens and spherical mirror and through the centers of curvature of all segments of the lens or mirror is called as Principal Axis

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Answer 2

Answer:

Principal Axis:-

• The line passing through the center of the surface of a lens and spherical mirror and through the centers of curvature of all segments of the lens or mirror is called as Principal Axis