alleryThe principal focus of a concave mirror is the point where:
AAll light rays meet after reflection
BParallel rays converge after reflection
CParallel rays diverge after reflection
DThe centre of curvature is located
Answer & Solution
Correct answer: B. Parallel rays converge after reflection
1. A concave mirror's focus is where rays parallel to the principal axis CONVERGE after reflection.
2. Only paraxial rays (close to the axis) converge sharply.
3. A convex mirror has a VIRTUAL focus — rays only appear to diverge from it.
_Source: syllabus Science Ch 9 §9.2.1 Principal Focus_
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