Question

All the distances from the curved surface are measured from the:

a) pole
b) centre of curvature
c) focus
d) radius of curvature
plz reply
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Answer 1

Pole is the answer.

Actually when we measure, we use metre scale and thread. But since option doesn't have it, so Pole is the answer . Because all curved surfaces has a pole . So, we can directly measure around it.

Hope it helps you