Explain the following terms related to spherical lenses :
(a) Centres of curvature
(b) Principal axis
(c) Optical centre
(d) Principal focus
At what distance from a concave lens of focal length 20 cm, should a 6 cm tall object be placed so that it forms an image at 15 cm from the lens ? Also determine the size of the image formed.
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centre of curvature : it is the centre of sphere of which refracting surface forms a part
principal axis: the line joining the pole and center of curvature and extends on either side of surface is called principal axis
optical center: a point on the axis of a lens that is located at any ray of light passing through it and which doesn't suffers net deviation is called optical center
focus : the light Ray's parallel to principal axis after refraction passes through a point the point is called principal focus
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