A. between the principal focus and the pole
B. at the centre of the curvature
C. between the principal focus and the centre of curvature
D. at infinity
Correct Answer: Option D
C. between the principal focus and the centre of curvature
A. between the principal focus and the pole
B. at the centre of the curvature
C. between the principal focus and the centre of curvature
D. at infinity
Correct Answer: Option D
C. between the principal focus and the centre of curvature
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