Which of the following (referred to as spherical mirror) depends on whether the rays are paraxial or not?

Pole

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Focus

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Radius of curvature

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Principal axis

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Solution

The correct option is B Focus
The pole, the radius of curvature, and the principal axis are the geometric nomenclatures of points and axis respectively.
However focus is the only point where a parallel beam of light concentrates after reflection, which depends upon the nature of rays.

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The destiny of parallel rays in a spherical mirror (within paraxial approximation) is :

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