4.
With the help of a suitable diagram, explain the meaning of terms:
(a) centres of curvature (b) optical centre (c) focus
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CENTRE OF CURVATURE: The reflecting surface of a spherical mirror form a part of sphere. It has a centre which is known as Centre of Curvature. It is denoted by (C).
Optical Centre : It is the central point of lens through which a ray of light passes without suffering any deviation.
Focus of Concave Lens: It is also know as focal point. The point on the principal axis where all parallel lines meet after reflection. It is denoted by (F).
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