user-avatar
phamtham1984.tp3
2 năm trước
Một người cận thị có điểm cực viễn cách mắt 200 cm. Hỏi người ấy phải đeo thấu kính gì, có tiêu cự bao nhiêu để sửa tật cận thị đó? A.Thấu kính hội tụ có tiêu cự 200 cm. B.Thấu kính hội tụ có tiêu cự 50 cm. C.Thấu kính phân kì có tiêu cự 200 cm. D.Thấu kính phân kì có tiêu cự 50 cm.
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

Read the following passage and choose the best answers to each of the questions below. I’m in the hospital! I’ve broken my leg! But don’t worry. I’ll be all right. I’ve been here since last Sunday. I had an accident at a football match. I tried to kick the ball but I kicked the goal post! The pain was quite bad, so Dad brought me to the hospital the same day. I had a small operation three days ago. The nurses and doctors have been really nice, but the food’s disgusting. I prefer Mum’s cooking! goal post (n) cột khung thành /operation (n) ca phẫu thuật Where is the writer? A. He’s going on a vacation. B. He’s at home. C. He’s in hospital. D. He’s at school. What has happened to him? A. He has had a cold. B. He has broken his leg. C. He has had an accident. D. b & c are correct He felt _________pain. A. no B. not much C. a lot of D. a&b are correct What does the word ‘disgusting’ in line 4 mean? A. delicious B. good C. healthy D. awful Which of the following is NOT true? A. The writer has broken his leg because he kicked the goal post. B. He was brought to the hospital last Sunday. C. He doesn’t like the nurses and the doctors there. D. He had a small operation and he will be all right.

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