The Formula
The number of images formed by two plane mirrors inclined at an angle θ is given by:
* N = 360°/θ - 1
Calculation
1. Substitute the angle: In this case, θ = 60°
2. Calculate: N = 360°/60° - 1 = 6 - 1 = 5
Therefore, 5 images will be formed when two mirrors are placed at a 60-degree angle.