n=360°/A-1
n= number of images, A= angle between the mirrors
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120° ⇒ n=(360/A) - 1 = (360/120) - 1 = 3 - 1 = 2 images
90° ⇒ n=(360/A) - 1 = (360/90) - 1 = 4 - 1 = 3 images
60° ⇒ n=(360/A) - 1 = (360/60) - 1 = 6 - 1 = 5 images
45° ⇒ n=(360/A) - 1 = (360/45) - 1 = 8 - 1 = 7 images
30° ⇒ n=(360/A) - 1 = (360/30) - 1 = 12 - 1 = 11 images
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