Define following terms: (a) pole (b) centre of curvature (c) principal axis (d) principal focus.
Answers
POLE: the centre of the reflecting surface of a spherical mirror is a point called the pole
CENTRE OF CURVATURE: the centre of curvature of a spherical mirror is the centre of the hollow sphere of glass of which the mirror is a part
PRINCIPAL AXIS: the straight line passing through the centre of curvature and pole of a spherical mirror is called it's principal axis
PRINCIPAL FOCUS: the principal focus of a spherical mirror is a point on its principal axis to which the reflected light rays either coverge or appears to diverge from it.
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Answer:
Explanation:
Answer :-
(a) Pole - The central point of the reflecting spherical surface is called pole (P). It lies on the surface of the mirror.
(b) Centre of curvature - The centre of the hollow sphere of which the reflecting surface of the mirror is a part.
(c) Principal axis - Straight line passing through the pole and the centre of the curvature of a spherical mirror.
(d) Principal focus - Incident rays parallel to the principal axis, after reflection either converge to or appear to diverge from a fixed point on the principal focus of the spherical mirror.