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Q: The diameter of the reflecting surface of a spherical mirror is called a/an -
  • A. aperture
  • B. principal axis
  • C. pole
  • D. focus
Correct Answer: Option A - The diameter of the reflective surface of a spherical mirror is called an aperture. Aperture or hole is the apparent area of a spherical mirror or lens through which light can pass easily.
A. The diameter of the reflective surface of a spherical mirror is called an aperture. Aperture or hole is the apparent area of a spherical mirror or lens through which light can pass easily.

Explanations:

The diameter of the reflective surface of a spherical mirror is called an aperture. Aperture or hole is the apparent area of a spherical mirror or lens through which light can pass easily.