Post-UTME Physics 2018 Objective — Question 11
Question 11 of 20 from the Post-UTME Screening (Post-UTME) Physics 2018 Objective paper, with the correct answer and a full explanation.
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A virtual image of an object was obtained at a distance of 30.0 cm from a converging lens of focal length 20.0cm. What is the distance of the object from the lens?
- A. 30.0cm
- B. 12.0cmCorrect
- C. 10.0cm
- D. 7.5cm
Explanation
For a virtual image, v=-30cm, f=20cm. Using 1/v-1/u=1/f: -1/30-1/u=1/20, giving u=-12cm, so object distance is 12.0cm.
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