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Q: An imaginary line passing through principal focus, centre of curvature and pole of a spherical Mirror is known as ______.
  • A. Focal plane
  • B. Radius of curvature
  • C. Principal axis
  • D. Focal length
Correct Answer: Option C - An imaginary line passing through principal focus, centre of curvature and pole of a spherical mirror is known as principal axis.
C. An imaginary line passing through principal focus, centre of curvature and pole of a spherical mirror is known as principal axis.

Explanations:

An imaginary line passing through principal focus, centre of curvature and pole of a spherical mirror is known as principal axis.