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Q: A beam of light parallel to the ______ of a concave mirror, after reflection, will pass through the principal focus.
  • A. focal plane
  • B. object on the principal axis
  • C. principal axis
  • D. surface of mirror
Correct Answer: Option C - A beam of light parallel to the principal axis of a concave mirror, after refection, will pass through the principal focus.
C. A beam of light parallel to the principal axis of a concave mirror, after refection, will pass through the principal focus.

Explanations:

A beam of light parallel to the principal axis of a concave mirror, after refection, will pass through the principal focus.