WAEC Physics 2012 Objective — Question 29
Question 29 of 50 from the West African Examinations Council (WAEC) Physics 2012 Objective paper, with the correct answer and a full explanation.
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An object is placed 20.0cm in front of a converging lens of focal length 15cm. Calculate its image distance.
- A. A. 1.3 cm
- B. B. 8.6 cm
- C. C. 35.0 cm
- D. D. 60.0 cmCorrect
Explanation
Using 1/f = 1/v + 1/u: 1/15 = 1/v + 1/20 => 1/v = 1/15 - 1/20 = 1/60 => v = 60 cm.
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