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The normal at any point on a spherical mirror lies along the line joining that point to the
Apole of the mirror
Bprincipal focus
Cthe focal plane
Dcentre of curvature
Answer & Solution
Correct answer: D. centre of curvature
1. A radius of a circle is always perpendicular to the tangent at that point.
2. The mirror is part of a sphere whose centre is C.
3. So the line from any surface point to C is the normal there.
_Source: AP/TS SCERT Class 10 Physical Science, "Reflection of Light at Curved Surfaces"_
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