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Q: A light beam that appears at the main focus of a concave lens will emit after refraction.
  • A. parallel to the principal axis
  • B. through the main focus
  • C. without any deviation
  • D. through the center of curvature
Correct Answer: Option A - A light beam that appears at the main focus of a concave lens will become parallel to the principal axis after refraction.
A. A light beam that appears at the main focus of a concave lens will become parallel to the principal axis after refraction.

Explanations:

A light beam that appears at the main focus of a concave lens will become parallel to the principal axis after refraction.