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A spherical mirror whose reflecting surface curves inwards (towards the centre of the sphere) is called:
APlano-concave
BConvex
CConcave
DPlano-convex
Answer & Solution
Correct answer: C. Concave
1. A concave mirror has its reflecting surface curved inwards.
2. A convex mirror has the reflecting surface curved outwards.
3. Plano-concave/plano-convex describe lenses, not mirrors.
_Source: NCERT Class 10 Science, Ch 9 "Light Reflection and Refraction", §9.2_
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