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Q: A point on the principal axis which is at double the distance between P and F for a Spherical mirror is :
  • A. principal focus
  • B. infinity
  • C. centre of curvature
  • D. pole
Correct Answer: Option C - Centre of curvature is a point on principal axis which is at triple the distance between principal (p) and focus (f) of a spherical mirror, hence option 3 is correct.
C. Centre of curvature is a point on principal axis which is at triple the distance between principal (p) and focus (f) of a spherical mirror, hence option 3 is correct.

Explanations:

Centre of curvature is a point on principal axis which is at triple the distance between principal (p) and focus (f) of a spherical mirror, hence option 3 is correct.