user-avatar
vuongduy280
1 năm trước
chùm tia sáng hẹp đi từ không khí tới bề mặt một môi trường trong suốt có chiết suất n sẽ có một phần phản xạ và một phần khúc xạ với góc khúc xạ r = 53 độ Biết tia phản xạ và tia khúc xạ vuông góc với nhau .Tính chiết suất n
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

1. My classmates suggested playing chess but I prefer ________ hike and seek. A. playing B. play C. played D to playing 2. You don’t like English food. What about ________Chinese food? A. to eat B. eat C. eating D. ate 3. I think we should ________ up our neighborhood. A. to clean B. clean C. cleaning D. cleaned 4. Our teacher suggests ________a meeting to discuss about the solution to keep our environment clean. A. to hold B. hold C. holding D. held 5. Her former leader suggests that she should ________ harder to break her past records. A. to train B. train C. training D. trained 6. The children volunteer to clean up the local park ________ there are lot of used cans and trash there. A. but B. because C. and D. so 7. Her mother took her to the zoo ________ it owed her some rare animals. A. but B. because C. and D. so 8. The “Green Sunday” was short: ________, the students enjoyed it very much. A. but B. because C. however D. although 9. Hoa missed the bus this morning, ________ she went to school late. A. but B. so C. however D. and 10. Dioxins are dangerous chemicals________ they can cause cancer and birth defects. A. but B. however C. because D. therefore 11. The children ate too much sweet ________ they get toothache easily. A. so B. and C. but D. because 12. Organically grown fruits and vegetables may not look as perfect, ________ it’s good for your health. A. so B. and C. however D. therefor 13. Thousand s of gallons of water were polluted ________some body spilled the motor oil and it swept into the ground. A. because B. so C. and D. however 14. ________ we use less electricity, power plants will burn less fuel. A. If B. So C. Therefore D. Because 15. Old newspapers can be used to make newspapers, ________ you can collect them and bring them to the recycling center. A. so B. because C. and D. therefore 16. Don’t use Styrofoam or aerosol spray ________ they both contain chlorofluorocarbons. A. so B. because C. and 17. Pesticides are chemicals poisons used by farmers to kill weeds and insect pests, ________ some pesticides are still in the food when it gets to the market. A. so B. because C. and D. however 18. We use paper whenever we can, ________ the backs of envelopes or the clean backs of notebook sheets are great for scrap paper. A. so B. because C. but D. however 18. He didn’t go to school yesterday; ______.he had to ask his friends what they learned then. A. but B. therefore C. and D. so 20. The countryside is very peaceful ________ the air is so fresh. A. but B. and C. therefore D. because

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