alleryCross-section of a convex lens looks like:
ATwo outward-bulging surfaces
BTwo flat surfaces
CTwo inward-curving surfaces
DHalf disc
Answer & Solution
Correct answer: A. Two outward-bulging surfaces
1. A convex lens is thicker at the centre than the edges.
2. Both surfaces curve outwards (away from the centre).
3. So its cross-section shows two outward-bulging surfaces.
4. A concave lens has two inward-curving surfaces.
_Source: Selina Concise Physics ICSE Class 10, Ch 5 'Refraction through a Lens' (aplustopper.com extract)_
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