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प्रश्न
The distance from the pole to the focus is called ______.
विकल्प
pole length
focal length
principal axis
None of the above
उत्तर
The distance from the pole to the focus is called focal length.
Explanation:
The distance from the pole (the center of a spherical mirror or lens) to the focus (the point where light rays converge or appear to diverge) is called the focal length.
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