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What do you mean by a lens? What are con...

What do you mean by a lens? What are concave and convex lenses? What do you mean by Prnicipal axis, Optical centre and Principal focus and focal length of a lens?

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(i) Optical centre : it is point of lens through which light ray is passed without deviation .
(ii) The principal axis : The line joining opticalcentre focus of lens is called principal axis .
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