user-avatar
636564297106373
2 năm trước
Đặt hai gương phẳng G1 và G2 vuông góc với nhau và quay mặt phản xạ vào nhau . Trong khoảng giữa hai mặt phản xạ của hai gương có một nguồn sáng điểm S. a) Xét một tia sáng SI1 (nằm trong mặt phẳng hình vẽ ) , xuất phát từ S đến phản xạ trên gương (G2) tia sáng có phương song song với tia tới SI1 b) Vẽ và trình bày cách vẽ đường đi của một tia sáng xuất phát từ S, sau khi phản xạ lần lượt trên 2 gương (G1) và (G2) phản xạ đi qua một điểm R cho trước nằm trong mặt phẳng hình vẽ
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

Ít Điểm lần 2 :<< cho bỏ 1 bài trừ bài 11 11. Rewrite the following sentences so that their meaning stays the same. 1. The distance from my house to school is about 500 metres. (It) 2. My father went to work by car some years ago, but now he goes by bus. (used to) 3. Don't drive too fast or you'll have an accident. (If) 4. Is it possible to go to Sa Pa by motorbike? (Can). 5. My mother is a careful driver. (drives) 6. Choose the correct option for each gap in the sentences 1. Minh used to _____ his homework late in the evening. A. does B. do C. doing D. did 2. If people _________ the rules, there are no more accidents. A. follow B. take care of C. obey D. remember 3. You should _________ right and left when you go across the roads. A. see B. look C. be D. take 4. Hurry up or we can't _________ the last bus home. A. keep B. follow C. go D. catch 5. Lan used to go to school _________. A. with bicycle B. by foot C. in car D. by bus 6. Public _________ in my town is good and cheap. A. transport B. tour C. journey D. travel 7. _________ is not very far from here to the city center. A. That B. This C. It D. There 8. When there is a traffic jam, it _________ me a very long time to go home. A. costs B. takes C. lasts D. spends 9. Mai's dad usually drives her to school _________ her school is very far from her house. A. but B. though C. because D. or 10. Yesterday Hoa and Lan _________ round West Lake. It took them an hour. A. cycle B. cycles C. cycling D. cycled 7. Fill each blank with a word in the box vehicles across did ride feels break it rules accidents after 1. What _________ you do last Sunday? 2. I stayed at home and looked _________ my younger brother yesterday. 3. Does your bike ever _________ down on the way to school? 4. We must always obey traffic _________ for our safety. 5. How far is _________ from your house to the bus stop? 6. He used to _________ a tricycle when he was three years old. 7. Now there are more traffic _________ than there used to be in this city. 8. There did not use to be many _________ on the roads in my home town. 9. He lives in a small village in the mountains so he never _______ worried about traffic jams. 10. You should remember to walk _________ the streets at the zebra crossings

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team