WAEC Physics 2011 Theory — Question 27

Question 27 of 39 from the West African Examinations Council (WAEC) Physics 2011 Theory paper, with the correct answer and a full explanation.

13(b)(iii) The focal length of the lens used to correct this defect is 10cm. Calculate the power of the lens.

Model answer

Power of lens = 1/focal length. Where focal length = 10cm = 0.1m, Power of lens = 1/0.1 = 10D (dioptre).

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