define (i) pole of vertex (ii) centre of curvature (iii) principal focus (iv) focal length
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Principal axis is an imaginary line passing through the pole and thecentre of curvature of a spherical mirror. (e) Principal focus is a point on the principal axis, where a beam of light, parallel to the principal axis, after reflection, either actually meets (concave) or appears to meet (convex).
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(i) Pole of vertex means the midpoint of a spherical mirror.
(ii) Centre of curvature means the centre of the sphere of which the spherical mirror is a part.
(iii) Principal focus means a point on the principal axis where a beam of light parallel to the principal axis after reflection either actually meets or appears to meet.
(iv) Focal length means the linear distance between the pole and the principal focus.
(ii) Centre of curvature means the centre of the sphere of which the spherical mirror is a part.
(iii) Principal focus means a point on the principal axis where a beam of light parallel to the principal axis after reflection either actually meets or appears to meet.
(iv) Focal length means the linear distance between the pole and the principal focus.
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