Which of the following terms is not related to a spherical lens?

Focus

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Pole

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Principal axis

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Centre of curvature

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Solution

The correct option is B Pole
The Optical Center is the point on the principal axis at the center of the lens.

Pole is the center of spherical mirror

Therefore the correct answer here will be D, Pole.

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Which of the following term is not associated with a lens?

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