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Q: An object is placed at the principal focus of a concave lens. Which of the following options represents the characteristics of the image formed?
  • A. Virtual and enlarged
  • B. Virtual and highly diminished
  • C. Real and enlarged
  • D. Real and diminished
Correct Answer: Option B - Light rays after the refraction from a concave lens never converge instead they get diverge away from principal axis, therefore concave lenses create only virtual and highly diminished images. Therefore when an object placed at the principal focus of a concave lens, a virtual and highly diminished image of it, will be formed.
B. Light rays after the refraction from a concave lens never converge instead they get diverge away from principal axis, therefore concave lenses create only virtual and highly diminished images. Therefore when an object placed at the principal focus of a concave lens, a virtual and highly diminished image of it, will be formed.

Explanations:

Light rays after the refraction from a concave lens never converge instead they get diverge away from principal axis, therefore concave lenses create only virtual and highly diminished images. Therefore when an object placed at the principal focus of a concave lens, a virtual and highly diminished image of it, will be formed.