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Q: An object is placed on the principal axis of a lens of power 4.0 D, at a distance of 30 cm. The image formed is __________.
  • A. real and erect
  • B. real and inverted
  • C. virtual and erect
  • D. virtual and inverted
Correct Answer: Option B - When an object is placed on the principal axis of a lens of power 4.0D, at a distance of 30 cm. The image formed is real and inverted.
B. When an object is placed on the principal axis of a lens of power 4.0D, at a distance of 30 cm. The image formed is real and inverted.

Explanations:

When an object is placed on the principal axis of a lens of power 4.0D, at a distance of 30 cm. The image formed is real and inverted.