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n2 = 1,333 = 4/3
i = 45°
n1. sin i = n2. sin r
1,6. sin 45° = 4/3. sin r
1,6. 1/2. akar 2 = 4/3. sin r
sin r = 0,6. akar 2
r = 58,052°
pembulatan. jawabannya yang B