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OPTIL GEOMETRI• pemantulan cahaya
2 cermin datar
n = 3
α = ___?
n = 360°/α - 1
3 = 360°/α - 1
4 = 360°/α
α = 360° / 4
α = 90° ✓
sudut yang dibentuk kedua cermin tersebut 90°>