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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. radius of curvature
  • B. focal plane
  • C. focal length
  • D. principal axis
Correct Answer: Option D - The imaginary line passing through principal focus, the pole and the center of curvature of spherical mirror is called its principal axis.
D. The imaginary line passing through principal focus, the pole and the center of curvature of spherical mirror is called its principal axis.

Explanations:

The imaginary line passing through principal focus, the pole and the center of curvature of spherical mirror is called its principal axis.