Define principal axis of a spherical mirror.
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The line passing through the pole and the centre of curvature is called principal axis.
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Principal Axis of a spherical mirror is the line passing through the centre of the mirror that is exactly perpendicular to the surface of the mirror. It sometimes also referred as 'the normal'.
By defination, a spherical mirror is symmetrically rotational about its principal axis.
One of the light rays used to draw a ray diagram of image formation remains parallel to the principal axis that passes through the focus.
The height of the object which is placed perpendicularly upwards at the principal axis is takes positive and the height of the object which is placed perpendicularly downwards at the principal axis is taken as negative.
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