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Per NCERT, what is the PRINCIPAL FOCUS (F) of a CONCAVE mirror?
AThe centre of the sphere
BA point far behind the mirror
CA point on the rim of the mirror
DThe point on the principal axis where rays parallel to the principal axis CONVERGE after reflection
Answer & Solution
Correct answer: D. The point on the principal axis where rays parallel to the principal axis CONVERGE after reflection
Per NCERT §9.2, concave mirror's F = where parallel rays converge after reflection. Convex mirror's F is where reflected rays appear to diverge from.
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