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A lens that is thicker at its centre than at its edges and converges parallel incident rays to a point on the principal axis is classified as which type of lens?
APlane glass slab lens
BConcave (diverging) lens
CConvex (converging) lens
DCylindrical mirror lens
Answer & Solution
Correct answer: C. Convex (converging) lens
1. A lens bound by two surfaces puffed outward and thicker at the centre is a double convex lens.
2. Parallel rays incident on it converge to the principal focus, so it is a converging lens.
3. This matches option A; a concave lens is thinner at the centre and diverges rays.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 7 "Lenses", p.89_
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