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As per your syllabus, what is FOCAL LENGTH (f) of a spherical mirror?

AHalf the aperture
BTwice the radius of curvature
CThe distance between the POLE (P) and the PRINCIPAL FOCUS (F)
DDistance from pole to centre of curvature
Answer & Solution
Correct answer: C. The distance between the POLE (P) and the PRINCIPAL FOCUS (F)
As per your syllabus, f = distance PF. R = 2f relates focal length to radius of curvature.
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