Trên hình 4.1 vẽ một tia sáng SI chiếu lên một gương phẳng. Góc tạo bởi SI với mặt gương bằng \(30^0\). Hãy vẽ tiếp tia phản xạ và tính góc phản xạ. Phương pháp giải - Xem chi tiết Sử dụng lí thuyết về khúc xạ ánh sáng và các tia, góc trong hiện tượng khúc xạ ánh sáng. Lời giải chi tiết Cách vẽ: + Vẽ pháp tuyến \(IN\) vuông góc với gương phẳng. + Vẽ tia phản xạ \(IR\) nằm trong cùng mặt phẳng với tia tới và pháp tuyến tại điểm tới, sao cho góc tới \(i\) bằng góc phản xạ \(i\)’: \(i = i’\). - <rect fill="
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Theo định luật phản xạ ánh sáng \(\Rightarrow i=i'=20^0\) |
