WAEC Physics 2023 Objective — Question 23

Question 23 of 50 from the West African Examinations Council (WAEC) Physics 2023 Objective paper, with the correct answer and a full explanation.

Which of the following equations is not a correct mirror formula? [The symbols have their usual meanings]

A. 1/f=1/u+1/v
B. N=360/θ -1
C. f=1/DCorrect
D. m=v/u

Explanation

f=1/D is not a correct mirror formula — D is not a standard mirror-formula symbol; the correct relation is f=D (focal length formula uses different variables).

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