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Mọi người giúp e với ạ, e cảm ơn nhiều ạ! Câu 2. Chiếu một tia sáng đơn sắc đi từ không khí có tốc độ c đến thủy tinh. Gọi i là góc tới , r là góc khúc xạ trong thủy tinh , điều chỉnh tia sáng tới sao cho i= 58° thì i+r = 90° . tốc độ của ánh sáng này trong thủy tinh là A. 3c/8 B.5c/8 C. 53c/100 D. 17c/20
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