State the condition when a lens is called equiconvex or equi-concave.
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A lens is called an equiconvex or equi-concave lens, when the radii of curvature of the two surfaces of lens are equal.
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What is a lens?
Which lens is converging —
(i) an equiconcave lens or an equiconvex lens?
(ii) a concavo-convex lens or a convexo-concave lens?
Define the term focal length of a lens.
What do you mean by focal plane of a lens?