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If both surfaces of a thin lens have equal radii of curvature R, the lens is called:
AEquiconvex (if both bulge outwards)
BPlano-convex
CMeniscus across all cases
DCylindrical
Answer & Solution
Correct answer: A. Equiconvex (if both bulge outwards)
1. Both surfaces are curved with equal radii (one R1=+R, R2=-R).
2. If both bulge outwards, lens is thicker in the middle.
3. Such a lens is called equiconvex.
4. Plano-convex has one flat surface.
5. So the correct term is equiconvex.
_Source: Selina Concise Physics ICSE Class 10, Ch 5 'Refraction through a Lens' (aplustopper.com extract)_
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