A. the focus
B. infinity
C. the centre of curvature
D. a distance twice the radius of curvature
Correct Answer: Option C
C. the centre of curvature
A. the focus
B. infinity
C. the centre of curvature
D. a distance twice the radius of curvature
Correct Answer: Option C
C. the centre of curvature
Copyright warnings! Do not copy.