WAEC Physics 2010 Theory — Question 21

Question 21 of 22 from the West African Examinations Council (WAEC) Physics 2010 Theory paper, with the correct answer and a full explanation.

13(b) Seven virtual images of an object are formed when two plane mirrors are inclined at an angle θ to each other. Calculate the value of θ.

Model answer

The number of images formed when two plane mirrors are inclined at an angle θ is given by N = 360/θ - 1. Given N=7: 7+1=360/θ; θ=360/8=45°.

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