22. The line passing through the center of the lens and pole is
A. principal focus
B. principal axis
C. radius of curvature
D. focal length
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22. The line passing through the center of the lens and pole is
A. principal focus
B. principal axis
C. radius of curvature
D. focal length
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Answer:
B. principal axis
Explanation:
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Answer:
D. Focal Length
Explanation:
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